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Debt (Schedule Of Obligations Under Debt Arrangements) (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013 | Nov. 18, 2010 | Jun. 30, 2014 7.875% Senior Unsecured Notes [Member] | Dec. 31, 2013 7.875% Senior Unsecured Notes [Member] | Jun. 30, 2014 Five Point Seventy Five Percentage Senior Unsecured Notes [Member] | Dec. 31, 2013 Five Point Seventy Five Percentage Senior Unsecured Notes [Member] | Feb. 08, 2013 Five Point Seventy Five Percentage Senior Unsecured Notes [Member] | Jun. 30, 2014 Five Point Six Two Five Percentage Senior Unsecured Notes [Member] [Domain] | May 15, 2014 Five Point Six Two Five Percentage Senior Unsecured Notes [Member] [Domain] | Dec. 31, 2013 Five Point Six Two Five Percentage Senior Unsecured Notes [Member] [Domain]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Senior secured credit facility | $ 492,200 | $ 582,800 |  |  |  |  |  |  |  |  |
Senior unsecured notes | 1,050,707 | 700,772 |  | 350,707 | 350,772 | 350,000 | 350,000 |  | 350,000 |  | 0
Senior unsecured notes, stated rate |  |  | 7.875% | 7.875% | 7.875% | 5.75% | 5.75% | 5.75% |  | 5.63% |
Senior unsecured notes, unamortized premium |  |  |  | 740 | 772 |  |  |  |  |  |
Total long-term debt | $ 1,542,907 | $ 1,283,572 |  |  |  |  |  |  |  |  |

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