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Debt Obligations - Additional Information on Repurchase of Outstanding Unsecured Notes (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Extinguishment Of Debt [Line Items] |  |  |
Principal | $ 0 | $ 376,174,000 | $ 29,250,000
Repurchase Amount | 0 | 383,768,000 | 31,369,000
Gain (Loss) on Early Extinguishment of Debt | $ 0 | (7,594,000) | (2,119,000)
Acceleration of Deferred Financing |  | 152,000 | 40,000
$250.0M 5.400% Guaranteed Notes due 2014 [Member] |  |  |
Extinguishment Of Debt [Line Items] |  |  |
Principal |  | 218,549,000 | 19,830,000
Repurchase Amount |  | 219,404,000 | 20,853,000
Gain (Loss) on Early Extinguishment of Debt |  | (855,000) | (1,020,000)
Acceleration of Deferred Financing |  | 9,000 | 16,000
7.50% Guaranteed Notes due May 15, 2015 [Member] |  |  |
Extinguishment Of Debt [Line Items] |  |  |
Principal |  | 157,625,000 | 8,910,000
Repurchase Amount |  | 164,364,000 | 9,945,000
Gain (Loss) on Early Extinguishment of Debt |  | (6,739,000) | (1,036,000)
Acceleration of Deferred Financing |  | $ 143,000 | 23,000
$250.0M 6.00% Guaranteed Notes due 2016 [Member] |  |  |
Extinguishment Of Debt [Line Items] |  |  |
Principal |  |  | 510,000
Repurchase Amount |  |  | 571,000
Gain (Loss) on Early Extinguishment of Debt |  |  | (63,000)
Acceleration of Deferred Financing |  |  | $ 1,000

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- Definition The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 + Details
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