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Long-Term Debt - 10.000% Senior Unsecured Notes due 2027 (Details) - USD ($)	Apr. 11, 2019	Dec. 31, 2020	Jul. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt issuance costs and discount, net of issuance premium		$ 16,300,000		$ 10,800,000
Senior Notes | 10.000% senior unsecured notes due 2027
Debt Instrument [Line Items]
Debt instrument, stated rate	10.00%	10.00%
Face value of debt issued	$ 430,000,000.0		$ 115,000,000.0
Percentage of debt principal redeemable	40.00%
Percentage of principal			100.75%
Debt issuance costs and discount, net of issuance premium			$ 1,000,000.0
Senior Notes | 10.000% senior unsecured notes due 2027 | Redemption Period One
Debt Instrument [Line Items]
Redemption price of debt	110.00%
Senior Notes | 10.000% senior unsecured notes due 2027 | Redemption Period Two
Debt Instrument [Line Items]
Redemption price of debt	100.00%
Senior Notes | 10.000% senior unsecured notes due 2027 | Redemption Period Three
Debt Instrument [Line Items]
Redemption price of debt	105.00%
Senior Notes | 10.000% senior unsecured notes due 2027 | Redemption Period Four
Debt Instrument [Line Items]
Redemption price of debt	102.50%
Senior Notes | 10.000% senior unsecured notes due 2027 | Redemption Period Five
Debt Instrument [Line Items]
Redemption price of debt	100.00%
Senior Notes | 10.000% senior unsecured notes due 2027 | Redemption Period Six
Debt Instrument [Line Items]
Redemption price of debt	101.00%

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