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Condensed Consolidating Financial Information (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Debt Instrument [Line Items]          
Assets $ 4,409,152   $ 4,409,152   $ 4,478,924
Net income (loss) $ 25,425 $ (3,328) 54,103 $ (9,215)  
Net cash from operating activities     $ 241,449 232,501  
Senior Notes | 9.00% Senior Notes Due 2020          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 9.00%   9.00%    
Parent          
Debt Instrument [Line Items]          
Assets $ 3,650,128   $ 3,650,128   $ 3,457,936
Net income (loss)   (15,105)   (20,618)  
Net cash from operating activities     $ (38,073) (43,397)  
Parent | Senior Notes | 9.125% Senior Notes Due 2018          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 9.125%   9.125%   9.125%
Parent | Senior Notes | 9.00% Senior Notes Due 2020          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 9.00%   9.00%   9.00%
Parent | Senior Notes | 6.875 % Senior Notes Due 2023          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 6.875%   6.875%    
Guarantor Subsidiaries          
Debt Instrument [Line Items]          
Assets $ 4,550,209   $ 4,550,209   $ 4,390,771
Net income (loss)   26,970   105,686  
Net cash from operating activities     216,405 188,817  
Non-Guarantor Subsidiaries (100% Owned)          
Debt Instrument [Line Items]          
Assets 1,495,228   1,495,228   1,545,428
Net income (loss)   (19,761)   (41,526)  
Net cash from operating activities     49,409 54,828  
Non-Guarantor Subsidiaries (Not 100% Owned)          
Debt Instrument [Line Items]          
Assets 219   219   219
Net income (loss)   23,538   22,677  
Net cash from operating activities     (78) 35,866  
Eliminations          
Debt Instrument [Line Items]          
Assets $ (5,286,632)   (5,286,632)   $ (4,915,430)
Net income (loss)   $ (18,970)   (75,434)  
Net cash from operating activities     $ 13,786 $ (3,613)