Industry Segments - Corporate Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
General and administrative expense	$ 17,351	$ 23,862	$ 37,363	$ 44,210
Depreciation, amortization, and accretion	8,236	9,726	17,187	19,277
Interest expense, net	3,886	4,604	8,290	9,896
Warrants fair value adjustment			3,021	(326)
Other general corporate income, net	(2,232)	(541)	(7,327)	(520)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	6,654	13,179	18,597	10,187
Corporate Overhead
Segment Reporting Information [Line Items]
General and administrative expense	9,543	11,611	22,564	19,692
Depreciation, amortization, and accretion	248	175	418	372
Interest expense, net	4,044	4,749	9,107	10,204
Warrants fair value adjustment	2,698	11	3,021	(327)
Other general corporate income, net	189	365	(3,079)	413
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 16,722	$ 16,911	$ 32,031	$ 30,354