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Debt - Refinancing of 2019 Notes (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Debt Instrument [Line Items]          
Loss on extinguishment of debt   $ 33,235 $ 30,558 $ 33,235 $ 33,538
Senior Secured Notes [Member]          
Debt Instrument [Line Items]          
Redemption price percentage 6.375%        
Redemption Premium $ 31,000        
Scheduled interest payable 2,000        
First call date   May 15, 2015      
Accrued but unpaid interest 19,000        
Senior Secured Notes [Member] | Senior Secured Notes Due 2019 [Member]          
Debt Instrument [Line Items]          
Refinanced debt amount $ 480,000        
Debt amount   $ 480,000   $ 480,000  
State interest rate 8.50%        
Senior Secured Notes [Member] | Senior Secured Notes Due 2023 [Member]          
Debt Instrument [Line Items]          
Debt amount $ 530,000        
Maturity year of debt 2023        
State interest rate 5.375%        
Proceeds from senior secured notes $ 522,000