| **Acquisitions (Schedule Of Purchase Price Allocation) (Details) (USD $)In Thousands, unless otherwise specified** | Dec. 31, 2014          | Dec. 31, 2013          | Dec. 31, 2012          | May 01, 2012                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------|------------------------|------------------------|------------------------|-----------------------------------------------------------------------------------------------------------------------------|
| **Acquisitions [Abstract]**                                                                                        |                   |                   |                   |                                                                                                                        |
| Property, plant and equipment, net                                                                                 |                   |                   |                   | $ 119,595us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment      |
| Current assets                                                                                                     |                   |                   |                   | 6,852us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets                      |
| Other long-term assets                                                                                             |                   |                   |                   | 7,525us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets              |
| Goodwill                                                                                                           | 31,184us-gaap_Goodwill | 28,223us-gaap_Goodwill | 28,152us-gaap_Goodwill | 1,679us-gaap_Goodwill                                                                                                       |
| Total assets acquired                                                                                              |                   |                   |                   | 135,651us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets                           |
| Current liabilities                                                                                                |                   |                   |                   | 3,409us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities                 |
| Long-term debt, excluding current portion                                                                          |                   |                   |                   | 14,233us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt |
| Other long-term liabilities                                                                                        |                   |                   |                   | 15,855us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther        |
| Total liabilities assumed                                                                                          |                   |                   |                   | 33,497us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities                       |
| Net assets acquired                                                                                                |                   |                   |                   | $ 102,154us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet                            |

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.
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