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Borrowings - Schedule of Long-term Debt (Details)
$ in Thousands
Jun. 30, 2015
USD ($)
Nov. 10, 2014
lender
Sep. 30, 2014
USD ($)
Apr. 30, 2014
Debt Instrument [Line Items]        
Unamortized debt discounts $ (3,829)   $ (4,399)  
Long-term debt 1,554,207   1,535,433  
Total debt (net of discounts of $3,829 and $4,399, respectively) 1,554,207   1,535,433  
Senior Notes        
Debt Instrument [Line Items]        
Unamortized debt discounts (3,829)   (4,399)  
Long-term debt $ 1,430,762   $ 1,435,183  
Senior Notes | 8 1/8% Senior Notes Maturing June 2016        
Debt Instrument [Line Items]        
Stated interest rate on debt instrument (percent) 8.125%   8.125%  
Senior notes $ 172,879   $ 172,879  
Senior Notes | 6 5/8% Senior Secured Notes April 2018        
Debt Instrument [Line Items]        
Stated interest rate on debt instrument (percent) 6.625%   6.625%  
Senior notes $ 300,000   $ 300,000  
Senior Notes | 9 1/8% Senior Notes Maturing May 2019        
Debt Instrument [Line Items]        
Stated interest rate on debt instrument (percent) 9.125%   9.125%  
Senior notes $ 235,000   $ 235,000  
Senior Notes | 5 3/4% Senior Notes Maturing June 2019        
Debt Instrument [Line Items]        
Stated interest rate on debt instrument (percent) 5.75%   5.75% 5.75%
Senior notes $ 325,000   $ 325,000  
Senior Notes | 7 1/2% Senior Notes Maturing September 2021        
Debt Instrument [Line Items]        
Stated interest rate on debt instrument (percent) 7.50%   7.50%  
Senior notes $ 200,000   $ 200,000  
Senior Notes | 7 1/4% Senior Notes Maturing February 2023        
Debt Instrument [Line Items]        
Stated interest rate on debt instrument (percent) 7.25%   7.25%  
Senior notes $ 200,000   $ 200,000  
Senior Notes | TEU Senior Amortizing Notes        
Debt Instrument [Line Items]        
Senior notes $ 1,712   6,703  
Junior Subordinated Notes        
Debt Instrument [Line Items]        
Stated interest rate on debt instrument (percent) 7.987%      
Unamortized debt discounts $ (43,500)      
Long-term debt 57,287   55,737  
Cash Secured Loan        
Debt Instrument [Line Items]        
Long-term debt 22,368   22,368  
Revolving Credit Facility        
Debt Instrument [Line Items]        
Long-term debt 20,000   0  
Other Secured Notes Payable        
Debt Instrument [Line Items]        
Long-term debt $ 23,790   $ 22,145  
Number of Lenders No Credit Extension [Domain]        
Debt Instrument [Line Items]        
Line of Credit Facility, Number of Lenders | lender   1