Long-Term Debt and Interest Expense - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Debt Instrument [Line Items]
Cash payments for interest	$ 7,611		$ 16,919	$ 38,500
Commitment and other fees paid	0		187
Amortization of debt issuance costs and discounts	1,850		5,731
Change in accrued interest	57		4,934
Capitalized interest	(660)		(660)
Other	34		70
Total interest expense	$ 8,892		$ 27,181
Predecessor
Debt Instrument [Line Items]
Cash payments for interest		$ 5,899		38,459
Commitment and other fees paid		1,008		2,280
Amortization of debt issuance costs and discounts		1,528		5,876
Change in accrued interest		15,493		20,503
Capitalized interest		0		0
Other		25		70
Total interest expense		$ 23,953		$ 67,188