Long-Term Debt and Credit Facilities - Senior Secured Notes (Details) - USD ($)			1 Months Ended	3 Months Ended			12 Months Ended
	Dec. 09, 2021	Oct. 27, 2021	Dec. 31, 2021	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jul. 13, 2018	Jul. 12, 2017
Long-Term Debt and Credit Facilities.
Debt repayment in cash	$ 225,000,000.0	$ 225,000,000.0
Public exchange in cash		900
Debt instrument principle amount denomination		1,000
Debt instrument face amount exchanged		912,660,000
Gain (Loss) on Extinguishment of Debt				$ (11,381,000)	$ 28,070,000	$ (9,589,000)	$ 16,689,000	$ (9,589,000)	$ (1,404,000)
Outstanding debt			$ 1,249,227,000	1,249,227,000		$ 1,537,956,000	1,249,227,000	$ 1,537,956,000
Debt instrument, repayment made In cash	84,300,000
Senior secured notes
Long-Term Debt and Credit Facilities.
Principal amount											$ 1,000,000,000.0
Interest rate (in percent)											10.00%
Debt Instrument, Interest Rate, Stated Percentage											10.00%
Gain (Loss) on Extinguishment of Debt							15,300,000
Senior secured term loan
Long-Term Debt and Credit Facilities.
Principal amount											$ 350,000,000.0
Gain (Loss) on Extinguishment of Debt							15,300,000
Outstanding debt	212,100,000		$ 93,200,000	$ 93,200,000			$ 93,200,000
Secured 2023 notes
Long-Term Debt and Credit Facilities.
Interest rate (in percent)			11.50%	11.50%			11.50%
Debt Instrument, Interest Rate, Stated Percentage			11.50%	11.50%			11.50%
Debt instrument principle amount denomination		$ 1,000
Debt instrument face amount exchanged percentage		91.30%
Gain (Loss) on Extinguishment of Debt							$ 12,900,000
Debt instrument face amount exchanged outstanding			$ 22,800,000	$ 22,800,000			22,800,000
Secured 2026 notes
Long-Term Debt and Credit Facilities.
Principal amount	127,800,000		4,500,000	$ 4,500,000			4,500,000
Net proceeds from 2026 notes			$ 3,600,000
Interest rate (in percent)		11.50%
Debt Instrument, Interest Rate, Stated Percentage		11.50%
Debt instrument principle amount denomination		$ 1,000
Debt instrument face amount exchanged	$ 662,660,000
Gain (Loss) on Extinguishment of Debt							$ 1,000,000.0
Senior secured revolving facility
Long-Term Debt and Credit Facilities.
Outstanding debt										$ 343,400,000