| **Industry Segments Data (Reportable segment revenues) (Details) (USD $)In Thousands, unless otherwise specified** | 3 Months Ended | 12 Months Ended |
|--------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Segment Reporting Information [Line Items]**                                                                     |           |            |   |   |   |   |   |   |   |   |   |
| Intersegment revenues                                                                                              |           |            |   |   |   |   |   |   | $ 6,265 | $ 6,317 | $ 5,618 |
| External revenues                                                                                                  | 183,676        | 178,494         | 176,104 | 171,907 | 168,812 | 177,703 | 168,089 | 164,777 | 710,181 | 679,381 | 651,250 |
| Total Revenues                                                                                                     |           |            |   |   |   |   |   |   | 716,446 | 685,698 | 656,868 |
| Cost Of Goods Sold Intersegment                                                                                    |           |            |   |   |   |   |   |   | 2,778 | 3,444 | 3,291 |
| Cost Of Goods Sold External                                                                                        |           |            |   |   |   |   |   |   | 247,501 | 227,399 | 207,817 |
| Total cost of Goods Sold                                                                                           |           |            |   |   |   |   |   |   | 250,279 | 230,843 | 211,108 |
| Contribution Intersegment                                                                                          |           |            |   |   |   |   |   |   | 3,487 | 2,873 | 2,327 |
| Contribution External                                                                                              |           |            |   |   |   |   |   |   | 462,680 | 451,982 | 443,433 |
| Total contribution                                                                                                 |           |            |   |   |   |   |   |   | 466,167 | 454,855 | 445,760 |
| Selling, general and administrative expenses                                                                       |           |            |   |   |   |   |   |   | 243,248 | 235,521 | 228,808 |
| Share-based compensation expense                                                                                   |           |            |   |   |   |   |   |   | 5,040 | 6,620 | 6,733 |
| Plus loss attributable to non-controlling interest                                                                 |           |            |   |   |   |   |   |   | 867 | 238 | 0 |
| Plus net loss (income) attributable to equity investment                                                           |           |            |   |   |   |   |   |   | (2) | 297 | 0 |
| Noncash Contribution Expense                                                                                       |           |            |   |   |   |   |   |   | 960 |   | (160) |
| Asset Retirement Obligation, Accretion Expense                                                                     |           |            |   |   |   |   |   |   | (508) | (619) | (289) |
| Adjusted EBITDA                                                                                                    |           |            |   |   |   |   |   |   | 226,809 | 223,641 | 221,487 |
| Consumer [Member]                                                                                                  |           |            |   |   |   |   |   |   |   |   |   |
| **Segment Reporting Information [Line Items]**                                                                     |           |            |   |   |   |   |   |   |   |   |   |
| Intersegment revenues                                                                                              |           |            |   |   |   |   |   |   | 0 | 0 | 0 |
| External revenues                                                                                                  |           |            |   |   |   |   |   |   | 352,972 | 352,574 | 342,898 |
| Total Revenues                                                                                                     |           |            |   |   |   |   |   |   | 352,972 | 352,574 | 342,898 |
| Cost Of Goods Sold Intersegment                                                                                    |           |            |   |   |   |   |   |   | 146 | 0 | 0 |
| Cost Of Goods Sold External                                                                                        |           |            |   |   |   |   |   |   | 128,324 | 110,693 | 104,481 |
| Total cost of Goods Sold                                                                                           |           |            |   |   |   |   |   |   | 128,470 | 110,693 | 104,481 |
| Contribution Intersegment                                                                                          |           |            |   |   |   |   |   |   | (146) | 0 | 0 |
| Contribution External                                                                                              |           |            |   |   |   |   |   |   | 224,648 | 241,881 | 238,417 |
| Total contribution                                                                                                 |           |            |   |   |   |   |   |   | 224,502 | 241,881 | 238,417 |
| Selling, general and administrative expenses                                                                       |           |            |   |   |   |   |   |   | 139,191 | 134,951 | 127,130 |
| Share-based compensation expense                                                                                   |           |            |   |   |   |   |   |   | 2,586 | 3,457 | 3,361 |
| Plus loss attributable to non-controlling interest                                                                 |           |            |   |   |   |   |   |   | 0 | 0 |   |
| Plus net loss (income) attributable to equity investment                                                           |           |            |   |   |   |   |   |   | 0 | 0 |   |
| Noncash Contribution Expense                                                                                       |           |            |   |   |   |   |   |   | 533 |   | (81) |
| Asset Retirement Obligation, Accretion Expense                                                                     |           |            |   |   |   |   |   |   | 282 | 347 | 149 |
| Adjusted EBITDA                                                                                                    |           |            |   |   |   |   |   |   | 88,858 | 110,734 | 114,716 |
| Network Access [Member]                                                                                            |           |            |   |   |   |   |   |   |   |   |   |
| **Segment Reporting Information [Line Items]**                                                                     |           |            |   |   |   |   |   |   |   |   |   |
| Intersegment revenues                                                                                              |           |            |   |   |   |   |   |   | 259 | 0 | 0 |
| External revenues                                                                                                  |           |            |   |   |   |   |   |   | 105,447 | 105,456 | 107,227 |
| Total Revenues                                                                                                     |           |            |   |   |   |   |   |   | 105,706 | 105,456 | 107,227 |
| Cost Of Goods Sold Intersegment                                                                                    |           |            |   |   |   |   |   |   | 114 | 600 | 600 |
| Cost Of Goods Sold External                                                                                        |           |            |   |   |   |   |   |   | 24,356 | 28,744 | 25,030 |
| Total cost of Goods Sold                                                                                           |           |            |   |   |   |   |   |   | 24,470 | 29,344 | 25,630 |
| Contribution Intersegment                                                                                          |           |            |   |   |   |   |   |   | 145 | (600) | (600) |
| Contribution External                                                                                              |           |            |   |   |   |   |   |   | 81,091 | 76,712 | 82,197 |
| Total contribution                                                                                                 |           |            |   |   |   |   |   |   | 81,236 | 76,112 | 81,597 |
| Selling, general and administrative expenses                                                                       |           |            |   |   |   |   |   |   | 26,841 | 27,837 | 33,566 |
| Share-based compensation expense                                                                                   |           |            |   |   |   |   |   |   | 790 | 1,214 | 1,598 |
| Plus loss attributable to non-controlling interest                                                                 |           |            |   |   |   |   |   |   | 0 | 0 |   |
| Plus net loss (income) attributable to equity investment                                                           |           |            |   |   |   |   |   |   | 0 | 0 |   |
| Noncash Contribution Expense                                                                                       |           |            |   |   |   |   |   |   | 169 |   | (41) |
| Asset Retirement Obligation, Accretion Expense                                                                     |           |            |   |   |   |   |   |   | 89 | 120 | 71 |
| Adjusted EBITDA                                                                                                    |           |            |   |   |   |   |   |   | 55,298 | 50,209 | 50,259 |
| Commercial [Member]                                                                                                |           |            |   |   |   |   |   |   |   |   |   |
| **Segment Reporting Information [Line Items]**                                                                     |           |            |   |   |   |   |   |   |   |   |   |
| Intersegment revenues                                                                                              |           |            |   |   |   |   |   |   | 5,760 | 5,710 | 5,442 |
| External revenues                                                                                                  |           |            |   |   |   |   |   |   | 143,575 | 136,101 | 128,458 |
| Total Revenues                                                                                                     |           |            |   |   |   |   |   |   | 149,335 | 141,811 | 133,900 |
| Cost Of Goods Sold Intersegment                                                                                    |           |            |   |   |   |   |   |   | 2,253 | 2,283 | 2,515 |
| Cost Of Goods Sold External                                                                                        |           |            |   |   |   |   |   |   | 66,895 | 65,170 | 59,885 |
| Total cost of Goods Sold                                                                                           |           |            |   |   |   |   |   |   | 69,148 | 67,453 | 62,400 |
| Contribution Intersegment                                                                                          |           |            |   |   |   |   |   |   | 3,507 | 3,427 | 2,927 |
| Contribution External                                                                                              |           |            |   |   |   |   |   |   | 76,680 | 70,931 | 68,573 |
| Total contribution                                                                                                 |           |            |   |   |   |   |   |   | 80,187 | 74,358 | 71,500 |
| Selling, general and administrative expenses                                                                       |           |            |   |   |   |   |   |   | 42,014 | 41,085 | 38,838 |
| Share-based compensation expense                                                                                   |           |            |   |   |   |   |   |   | 1,041 | 1,276 | 1,117 |
| Plus loss attributable to non-controlling interest                                                                 |           |            |   |   |   |   |   |   | 0 | 0 |   |
| Plus net loss (income) attributable to equity investment                                                           |           |            |   |   |   |   |   |   | 0 | 0 |   |
| Noncash Contribution Expense                                                                                       |           |            |   |   |   |   |   |   | 156 |   | (24) |
| Asset Retirement Obligation, Accretion Expense                                                                     |           |            |   |   |   |   |   |   | 83 | 100 | 43 |
| Adjusted EBITDA                                                                                                    |           |            |   |   |   |   |   |   | 35,946 | 31,222 | 30,871 |
| Managed Broadband [Member]                                                                                         |           |            |   |   |   |   |   |   |   |   |   |
| **Segment Reporting Information [Line Items]**                                                                     |           |            |   |   |   |   |   |   |   |   |   |
| Intersegment revenues                                                                                              |           |            |   |   |   |   |   |   | 0 | 0 | 0 |
| External revenues                                                                                                  |           |            |   |   |   |   |   |   | 86,562 | 63,248 | 49,962 |
| Total Revenues                                                                                                     |           |            |   |   |   |   |   |   | 86,562 | 63,248 | 49,962 |
| Cost Of Goods Sold Intersegment                                                                                    |           |            |   |   |   |   |   |   | 0 | 0 | 0 |
| Cost Of Goods Sold External                                                                                        |           |            |   |   |   |   |   |   | 21,298 | 17,021 | 14,012 |
| Total cost of Goods Sold                                                                                           |           |            |   |   |   |   |   |   | 21,298 | 17,021 | 14,012 |
| Contribution Intersegment                                                                                          |           |            |   |   |   |   |   |   | 0 | 0 | 0 |
| Contribution External                                                                                              |           |            |   |   |   |   |   |   | 65,264 | 46,227 | 35,950 |
| Total contribution                                                                                                 |           |            |   |   |   |   |   |   | 65,264 | 46,227 | 35,950 |
| Selling, general and administrative expenses                                                                       |           |            |   |   |   |   |   |   | 24,087 | 18,246 | 17,338 |
| Share-based compensation expense                                                                                   |           |            |   |   |   |   |   |   | 595 | 657 | 651 |
| Plus loss attributable to non-controlling interest                                                                 |           |            |   |   |   |   |   |   | 867 | 238 |   |
| Plus net loss (income) attributable to equity investment                                                           |           |            |   |   |   |   |   |   | 2 | (297) |   |
| Noncash Contribution Expense                                                                                       |           |            |   |   |   |   |   |   | 102 |   | (14) |
| Asset Retirement Obligation, Accretion Expense                                                                     |           |            |   |   |   |   |   |   | 54 | 52 | 26 |
| Adjusted EBITDA                                                                                                    |           |            |   |   |   |   |   |   | 42,797 | 28,631 | 19,275 |
| Regulated Operations [Member]                                                                                      |           |            |   |   |   |   |   |   |   |   |   |
| **Segment Reporting Information [Line Items]**                                                                     |           |            |   |   |   |   |   |   |   |   |   |
| Intersegment revenues                                                                                              |           |            |   |   |   |   |   |   | 246 | 607 | 176 |
| External revenues                                                                                                  |           |            |   |   |   |   |   |   | 21,625 | 22,002 | 22,705 |
| Total Revenues                                                                                                     |           |            |   |   |   |   |   |   | 21,871 | 22,609 | 22,881 |
| Cost Of Goods Sold Intersegment                                                                                    |           |            |   |   |   |   |   |   | 265 | 561 | 176 |
| Cost Of Goods Sold External                                                                                        |           |            |   |   |   |   |   |   | 6,628 | 5,771 | 4,409 |
| Total cost of Goods Sold                                                                                           |           |            |   |   |   |   |   |   | 6,893 | 6,332 | 4,585 |
| Contribution Intersegment                                                                                          |           |            |   |   |   |   |   |   | (19) | 46 | 0 |
| Contribution External                                                                                              |           |            |   |   |   |   |   |   | 14,997 | 16,231 | 18,296 |
| Total contribution                                                                                                 |           |            |   |   |   |   |   |   | 14,978 | 16,277 | 18,296 |
| Selling, general and administrative expenses                                                                       |           |            |   |   |   |   |   |   | 11,115 | 13,402 | 11,936 |
| Share-based compensation expense                                                                                   |           |            |   |   |   |   |   |   | 28 | 16 | 6 |
| Plus loss attributable to non-controlling interest                                                                 |           |            |   |   |   |   |   |   | 0 | 0 |   |
| Plus net loss (income) attributable to equity investment                                                           |           |            |   |   |   |   |   |   | 0 | 0 |   |
| Noncash Contribution Expense                                                                                       |           |            |   |   |   |   |   |   | 0 |   | 0 |
| Asset Retirement Obligation, Accretion Expense                                                                     |           |            |   |   |   |   |   |   | 0 | 0 | 0 |
| Adjusted EBITDA                                                                                                    |           |            |   |   |   |   |   |   | $ 3,910 | $ 2,845 | $ 6,366 |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents Company's specificly defined non-GAAP measure - the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, accretion expense, non-cash contribution expense and noncontrolling interest.
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| X                                                                                                                                                                                                                                                                |
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| - Definition
No authoritative reference available.
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No definition available.
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| - Definition
No authoritative reference available.
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| X                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Cost Of Goods Sold From External Customers
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| X                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Cost Of Goods Sold From Related Parties
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate cost of goods produced and sold and services rendered during the reporting period.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of Income (Loss) attributable to the noncontrolling interest.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Noncash charitable contributions made by the entity during the period.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.
+ References
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| - Definition
Amount of total revenue for the reportable segments, including revenue from external customers, transactions with other operating segments of the same entity, and (gross) interest revenue. All considered to be "operating revenue" for purposes of the taxonomy.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a),(b),(c) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27 -Subparagraph a, b, c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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| - Definition
The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.
+ References
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| - Definition
The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.
+ References
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