Long-Term Debt and Interest Expense - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Debt Disclosure [Abstract]
Cash payments for interest	$ 1,580	$ 8,266	$ 22,310	$ 24,408
Change in accrued interest	9,236	56	8,050	3,046
Amortization of discounts	265	967	789	3,709
Amortization of deferred debt costs	590	214	1,745	586
Commitment and other fees paid	12	1,338	36	3,141
Other	46	55	73	95
Interest expense	$ 11,729	$ 10,896	$ 33,003	$ 34,985