| **Acquisitions (Narrative) (Details) (USD $)**                  | 0 Months Ended       | 9 Months Ended | 1 Months Ended |                              | 1 Months Ended |                           | 1 Months Ended |                       |
|-----------------------------------------------------------------|----------------------|----------------|----------------|------------------------------|----------------|---------------------------|----------------|-----------------------|
||
| Effective date of business acquisition                          | May 29,         2013 |           |           | Feb.        01,         2012 |           | Apr. 12,         2012     |           | Dec. 17,         2012 |   |
| Purchase price allocation to goodwill                           |                 |           |           |                         | $ 1,800,000    |                      |           |                  | $ 2,000,000 |
| Purchase price allocation to indefinite-lived intangible assets |                 |           |           |                         | 700,000        |                      | 800,000        |                  |   |
| Purchase price allocation to fixed assets                       |                 |           |           |                         | 2,400,000      |                      | 16,800,000     |                  | 17,800,000 |
| Purchase price allocation to other assets                       |                 |           |           |                         | 2,700,000      |                      | 2,500,000      |                  | 1,000,000 |
| Purchase price allocation to amortizable intangible assets      |                 |           |           |                         | 500,000        |                      | 1,200,000      |                  | 1,000,000 |
| Weighted-average amortization period (in years)                 |                 |           |           | 6 years 8 months 12 days     |           | 21 years 6 months 16 days |           | 10 years              |   |
| Purchase price allocation to liabilities assumed                |                 |           |           |                         | 2,600,000      |                      | 3,100,000      |                  | 1,800,000 |
| Payments to Acquire Businesses, Net of Cash Acquired            |                 | $ 19,958,000   | $ 23,479,000   | $ 5,700,000                  |           | $ 18,200,000              |           | $ 20,000,000          |   |

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| - Definition
Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.
+ References
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| - Definition
The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.
+ References
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| - Definition
Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.
+ References
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| - Definition
The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will not be amortized. Does not include goodwill.
+ References
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| - Definition
The amount of acquisition cost of a business combination allocated to liabilities assumed.
+ References
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| - Definition
Amount of acquisition cost of a business combination allocated to other assets not separately disclosed in the balance sheet.
+ References
No definition available.
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| - Definition
The amount of acquisition cost of a business combination allocated to property, plant and equipment to be used in ongoing operations.
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| - Definition
Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
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No definition available.
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| - Definition
The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.
+ References
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