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Debt - Senior Secured Second Priority Notes (Details) - Senior Secured Second Priority Notes - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2017
Jun. 30, 2016
Debt Instrument [Line Items]          
Loss on early extinguishment on debt $ 11,400,000        
Cash premium, percentage 3.00%        
Early extinguishment of debt cash premium $ 7,400,000        
Non-cash charge for write-off of unamortized deferred financing costs       $ 4,000,000  
Events of default, nonpayment of interest period       30 days  
Events of defaults, failure to comply with obligations or covenants, period       60 days  
Events of default, failure of subsidiary guarantors to comply with obligations, period       45 days  
Debt covenant, indebtedness (exceeds)       $ 150,000,000.0  
Debt covenant, failure to discharge judgment (in excess of)       100,000,000.0  
Debt covenant, minimum fair market value of collateral in force   $ 150,000,000.0   $ 150,000,000.0  
Upon Change in Control          
Debt Instrument [Line Items]          
Debt instrument redemption price percentage       101.00%  
Asset Sale          
Debt Instrument [Line Items]          
Debt instrument redemption price percentage       100.00%  
7.50% Senior Notes, Due 2022          
Debt Instrument [Line Items]          
Stated rate         7.50%
Debt instrument redemption price percentage       103.00%  
Principal amount redeemed 122,000,000 123,500,000 $ 122,000,000 $ 123,500,000  
7.50% Senior Notes, Due 2022 | Prior to June 1, 2019          
Debt Instrument [Line Items]          
Debt instrument redemption price percentage       100.00%  
Redemption price, percentage of principal amount redeemed       10.00%  
7.50% Senior Notes, Due 2022 | On or after June 1, 2019 and prior to June 1, 2020          
Debt Instrument [Line Items]          
Debt instrument redemption price percentage       103.75%  
7.50% Senior Notes, Due 2022 | On or after June 1, 2020 and prior to June 1, 2021          
Debt Instrument [Line Items]          
Debt instrument redemption price percentage       101.875%  
7.50% Senior Notes, Due 2022 | On or after June 1, 2021 and prior to June 1, 2022          
Debt Instrument [Line Items]          
Debt instrument redemption price percentage       100.00%  
2022 Notes, Optional Redemption          
Debt Instrument [Line Items]          
Aggregate principal amount         $ 610,000,000
Debt instrument redemption price percentage       107.50%  
2022 Notes, Optional Redemption | Prior to June 1, 2019          
Debt Instrument [Line Items]          
Debt instrument redemption price percentage       40.00%  
7.75% Senior Notes, Due 2024          
Debt Instrument [Line Items]          
Aggregate principal amount         $ 625,000,000
Stated rate         7.75%
Debt instrument redemption price percentage       103.00%  
Principal amount redeemed $ 125,000,000   125,000,000    
Loss on early extinguishment on debt   $ 5,600,000 $ 5,800,000    
7.75% Senior Notes, Due 2024 | Prior to June 1, 2019          
Debt Instrument [Line Items]          
Debt instrument redemption price percentage       100.00%  
Redemption price, percentage of principal amount redeemed       10.00%  
7.75% Senior Notes, Due 2024 | On or after June 1, 2019 and prior to June 1, 2020          
Debt Instrument [Line Items]          
Debt instrument redemption price percentage       105.813%  
7.75% Senior Notes, Due 2024 | On or after June 1, 2020 and prior to June 1, 2021          
Debt Instrument [Line Items]          
Debt instrument redemption price percentage       103.875%  
7.75% Senior Notes, Due 2024 | On or after June 1, 2021 and prior to June 1, 2022          
Debt Instrument [Line Items]          
Debt instrument redemption price percentage       101.938%  
7.75% Senior Notes, Due 2024 | On or after June 1, 2022          
Debt Instrument [Line Items]          
Debt instrument redemption price percentage       100.00%  
2024 Notes, Optional Redemption          
Debt Instrument [Line Items]          
Debt instrument redemption price percentage       107.75%  
2024 Notes, Optional Redemption | Prior to June 1, 2019          
Debt Instrument [Line Items]          
Redemption price, percentage of principal amount redeemed       40.00%