Long-Term Debt and Interest Expense - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt Disclosure [Abstract]
Cash payments for interest	$ 17,443	$ 18,818	$ 18,671	$ 20,428
Change in accrued interest	(8,024)	(9,334)	196	(1,186)
Amortization of debt discount	1,660	263	2,181	525
Amortization of deferred debt costs	1,664	591	2,251	1,155
Commitment and other fees paid	11	13	22	24
Other	21	7	72	26
Interest expense - continuing operations	$ 12,775	$ 10,358	$ 23,393	$ 20,972