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Debt - Senior Secured Second Priority Notes (Details) - Senior Secured Second Priority Notes
6 Months Ended
Jun. 30, 2016
USD ($)
Debt Instrument [Line Items]  
Debt redemption percentage based on original principal (up to) 101.00%
Debt redemption percentage based on outstanding principal alternative 100.00%
7.50% Senior Notes, Due 2022  
Debt Instrument [Line Items]  
Aggregate principal amount $ 610,000,000
Stated rate 7.50%
7.50% Senior Notes, Due 2022 | At any time prior to June 1, 2019  
Debt Instrument [Line Items]  
Debt redemption percentage based on original principal (up to) 100.00%
7.50% Senior Notes, Due 2022 | On or after June 1, 2019 and prior to June 1, 2020  
Debt Instrument [Line Items]  
Debt redemption percentage based on original principal (up to) 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 redemption percentage based on original principal (up to) 101.875%
7.50% Senior Notes, Due 2022 | On or after June 1, 2021  
Debt Instrument [Line Items]  
Debt redemption percentage based on original principal (up to) 100.00%
2022 Notes, Optional Redemption  
Debt Instrument [Line Items]  
Debt redemption percentage based on original principal (up to) 107.50%
2022 Notes, Optional Redemption | At any time prior to June 1, 2019  
Debt Instrument [Line Items]  
Debt redemption percentage based on original principal (up to) 40.00%
7.75% Senior Notes, Due 2024  
Debt Instrument [Line Items]  
Aggregate principal amount $ 625,000,000
Stated rate 7.75%
7.75% Senior Notes, Due 2024 | At any time prior to June 1, 2019  
Debt Instrument [Line Items]  
Debt redemption percentage based on original principal (up to) 100.00%
7.75% Senior Notes, Due 2024 | On or after June 1, 2019 and prior to June 1, 2020  
Debt Instrument [Line Items]  
Debt redemption percentage based on original principal (up to) 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 redemption percentage based on original principal (up to) 103.875%
7.75% Senior Notes, Due 2024 | On or after June 1, 2021  
Debt Instrument [Line Items]  
Debt redemption percentage based on original principal (up to) 101.938%
7.75% Senior Notes, Due 2024 | On or after June 1, 2022  
Debt Instrument [Line Items]  
Debt redemption percentage based on original principal (up to) 100.00%
2024 Notes, Optional Redemption  
Debt Instrument [Line Items]  
Debt redemption percentage based on original principal (up to) 107.75%
2024 Notes, Optional Redemption | At any time prior to June 1, 2019  
Debt Instrument [Line Items]  
Debt redemption percentage based on original principal (up to) 40.00%