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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%

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Debt Instrument, Debt Default, Failure Of Collateral To Be In Full Force, Minimum Fair Market Value

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 55
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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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