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Borrowings - Narrative (Details)
3 Months Ended
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
lender
Dec. 31, 2014
USD ($)
Sep. 30, 2015
USD ($)
Jan. 15, 2010
USD ($)
Line of Credit Facility [Abstract]          
Amount of available borrowings under the Secured Revolving Credit Facility   $ 116,400,000      
Senior Notes [Abstract]          
Consolidated Tangible Net Worth   615,800,000      
Loss on extinguishment of debt   828,000 $ 0    
Junior Subordinated Notes [Abstract]          
Unamortized accretion   3,449,000   $ 3,639,000  
Secured Debt [Abstract]          
Notes Payable   1,502,056,000   1,528,275,000  
Senior Notes          
Junior Subordinated Notes [Abstract]          
Unamortized accretion   3,449,000   3,639,000  
Secured Debt [Abstract]          
Notes Payable   1,404,555,000   $ 1,427,240,000  
Senior Notes | 8 1/8% Senior Notes Maturing June 2016          
Senior Notes [Abstract]          
Minimum consolidated tangible net worth   $ 85,000,000      
Percentage of debt, at par, required to be offered for purchase   10.00%      
Amount of original debt that could be repurchased   $ 27,500,000      
Call price and make-whole premiums provided for by 2018 Notes   $ 22,900,000      
Stated interest rate on debt instrument (percent)   8.125%   8.125%  
Secured Debt [Abstract]          
Notes Payable   $ 148,004,000   $ 170,879,000  
Senior Notes | 6 5/8% Senior Secured Notes April 2018          
Senior Notes [Abstract]          
Stated interest rate on debt instrument (percent)   6.625%   6.625%  
Secured Debt [Abstract]          
Notes Payable   $ 300,000,000   $ 300,000,000  
Senior Notes | Subsequent Event | 8 1/8% Senior Notes Maturing June 2016          
Senior Notes [Abstract]          
Call price and make-whole premiums provided for by 2018 Notes $ 5,000,000        
Junior Subordinated Notes          
Senior Notes [Abstract]          
Stated interest rate on debt instrument (percent)   7.987%      
Aggregate principal amount of debt   $ 103,100,000     $ 75,000,000
Junior Subordinated Notes [Abstract]          
Effective period of debt instrument interest rate   10 years      
Unamortized accretion   $ 42,500,000      
Secured Debt [Abstract]          
Notes Payable   $ 58,320,000   57,803,000  
Cash Secured Loan          
Secured Debt [Abstract]          
Three-month LIBOR   LIBOR      
Notes Payable   $ 22,368,000   22,368,000  
Cash Secured Loan | London Interbank Offered Rate (LIBOR)          
Secured Debt [Abstract]          
Spread on variable interest rate (percent)   0.40%      
Other Secured Notes Payable          
Secured Debt [Abstract]          
Notes Payable   $ 16,813,000   20,864,000  
Weighted average fixed interest rate of debt (percent)   4.50%      
Revolving Credit Facility          
Line of Credit Facility [Abstract]          
Credit facility borrowing capacity   $ 145,000,000   130,000,000  
Inventory assets pledged as collateral   1,000,000,000      
Letters of credit secured using cash collateral   28,600,000      
Long-term Line of Credit   0   0  
Letter of Credit, Cash Secured          
Line of Credit Facility [Abstract]          
Letters of credit secured using cash collateral   $ 14,600,000   $ 14,400,000  
Number of Lenders Extending Credit Facility          
Line of Credit Facility [Abstract]          
Line of Credit Facility, Number of Lenders | lender   3