| **Business and Summary of Significant Accounting Principles (Narratives) (Details) (USD $)In Thousands, unless otherwise specified** | 3 Months Ended | 6 Months Ended |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
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| **Business and Summary of Significant Accounting Policies [Abstract]**                                                               |           |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |   |
| Year Founded                                                                                                                         |           |           | 1997                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |   |
| Immaterial Error Correction                                                                                                          |           |           | Immaterial Error CorrectionDuring the first quarter of 2012, we identified an error in the depreciable life of one fixed asset.  The error resulted in a $146,000 quarterly or $585,000 annual understatement of depreciation expense in 2007 through 2010 and a corresponding overstatement of net property and equipment in service for the same periods.  In the first and second quarters of 2011 the error resulted in a $146,000 quarterly understatement of depreciation expense and a corresponding overstatement of net property and equipment in service for the same periods.  In the third and fourth quarters of 2011 the error resulted in a $49,000 quarterly overstatement of depreciation expense and a corresponding understatement of net property and equipment in service for the same periods.  The net annual misstatement to 2011 was a $195,000 understatement to depreciation expense and a corresponding overstatement of net property and equipment in service for the same period.    In order to assess materiality of this error we considered Staff Accounting Bulletin (“SAB”) 99, “Materiality” and SAB 108, “Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements,” and determined that the impact of this error on prior period consolidated financial statements was immaterial. Although the error was and continues to be immaterial to prior periods, because of the significance of the out-of-period correction in the first quarter of 2012, we revised our prior period financial statements. |   |   |
| **Statement [Line Items]**                                                                                                           |           |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |   |
| Revenues                                                                                                                             | $ 176,104      | $ 168,089      | $ 348,011                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | $ 332,866 |   |
| Receivables                                                                                                                          | 161,840        |           | 161,840                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |   | 141,827 |
| Remote High Cost Support Program [Member]                                                                                            |           |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |   |
| **Statement [Line Items]**                                                                                                           |           |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |   |
| Receivables                                                                                                                          | 31,700         |           | 31,700                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |   |
| Urban High Cost Support Program [Member]                                                                                             |           |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |   |
| **Statement [Line Items]**                                                                                                           |           |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |   |
| Receivables                                                                                                                          | 5,500          |           | 5,500                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |   |   |
| Total High Cost Support Program [Member]                                                                                             |           |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |   |
| **Statement [Line Items]**                                                                                                           |           |           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |   |   |
| Revenues                                                                                                                             | $ 10,000       | $ 13,700       | $ 21,100                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | $ 26,000 |   |

| X                                                                                                                                                                                                                                            |
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Year the entity was founded, in CCYY format.
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Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.
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| - Definition
Describes nature and related effect on financial statements related to corrections of prior year errors in the current year financial statements when the effect of the prior year error was immaterial to the prior year financial statements and the current year correction is immaterial to the current year financial statements.
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| - 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.
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