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Condensed Consolidating Guarantor Financial Statements Details IS Summary (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 19,410,000 | $ 11,173,000 | $ 13,339,000 | $ 16,788,000 | $ 26,941,000 | $ 19,528,000 | $ 16,015,000 | $ 22,682,000 | $ 60,710,000 | $ 85,166,000 | $ 83,846,000
Comprehensive income |  |  |  |  |  |  |  |  | 22,578,000 | 56,649,000 | 79,025,000
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 60,710,000 | 85,166,000 | 83,846,000
Comprehensive income |  |  |  |  |  |  |  |  | 22,578,000 | 56,649,000 | 79,025,000
Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 41,520,000 | 52,775,000 | 54,076,000
Comprehensive income |  |  |  |  |  |  |  |  | 41,520,000 | 52,775,000 | 54,076,000
Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 46,445,000 | 53,335,000 | 52,710,000
Comprehensive income |  |  |  |  |  |  |  |  | 46,445,000 | 53,335,000 | 52,710,000
Consolidating Eliminations |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | (87,965,000) | (106,110,000) | (106,786,000)
Comprehensive income |  |  |  |  |  |  |  |  | $ (87,965,000) | (106,110,000) | (106,786,000)
Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 0 | 0
Comprehensive income |  |  |  |  |  |  |  |  |  | 0 | 0
Adjustments for New Accounting Pronouncement [Member] | Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 106,110,000 | 106,786,000
Comprehensive income |  |  |  |  |  |  |  |  |  | 106,110,000 | 106,786,000
Adjustments for New Accounting Pronouncement [Member] | Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 3,120,000 | 1,459,000
Comprehensive income |  |  |  |  |  |  |  |  |  | 3,120,000 | 1,459,000
Adjustments for New Accounting Pronouncement [Member] | Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | (3,120,000) | (1,459,000)
Comprehensive income |  |  |  |  |  |  |  |  |  | (3,120,000) | (1,459,000)
Adjustments for New Accounting Pronouncement [Member] | Consolidating Eliminations |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | (106,110,000) | (106,786,000)
Comprehensive income |  |  |  |  |  |  |  |  |  | (106,110,000) | (106,786,000)
Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 85,166,000 | 83,846,000
Comprehensive income |  |  |  |  |  |  |  |  |  | 66,749,000 | 83,035,000
Scenario, Previously Reported [Member] | Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | (20,944,000) | (22,940,000)
Comprehensive income |  |  |  |  |  |  |  |  |  | (20,944,000) | (22,940,000)
Scenario, Previously Reported [Member] | Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 49,655,000 | 52,617,000
Comprehensive income |  |  |  |  |  |  |  |  |  | 49,655,000 | 52,617,000
Scenario, Previously Reported [Member] | Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 56,455,000 | 54,169,000
Comprehensive income |  |  |  |  |  |  |  |  |  | 38,038,000 | 53,358,000
Scenario, Previously Reported [Member] | Consolidating Eliminations |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 0 | 0
Comprehensive income |  |  |  |  |  |  |  |  |  | 0 | 0
Scenario, Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Comprehensive income |  |  |  |  |  |  |  |  |  | (10,100,000) | (4,010,000)
Scenario, Adjustment [Member] | Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Comprehensive income |  |  |  |  |  |  |  |  |  | (28,517,000) | (4,821,000)
Scenario, Adjustment [Member] | Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Comprehensive income |  |  |  |  |  |  |  |  |  | 0 | 0
Scenario, Adjustment [Member] | Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Comprehensive income |  |  |  |  |  |  |  |  |  | 18,417,000 | 811,000
Scenario, Adjustment [Member] | Consolidating Eliminations |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Comprehensive income |  |  |  |  |  |  |  |  |  | $ 0 | $ 0

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