CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ 18,750	$ 5,691	$ 10,035	$ (6,951)	$ 4,463	$ 4,369	$ 12,928	$ (22,618)	$ 27,525	$ (858)	$ (104,671)
Other comprehensive loss:
Unrealized loss on cash flow hedges, net of tax benefit of ($2,278), ($922), and $0, respectively	2,064	(1,641)	(4,688)	(2,936)	(4,698)	1,738	2,314	(2,290)	(7,201)	(2,936)
Unrealized (loss) gain on defined benefit plan, net of tax (benefit) provision of ($259), $142, and ($151), respectively	(838)	7	6	6	694	26	26	(292)	(819)	454	(246)
Total other comprehensive loss									(8,020)	(2,482)	(246)
Comprehensive income (loss)	$ 19,976	$ 4,057	$ 5,353	$ (9,881)	$ 459	$ 6,133	$ 15,268	$ (25,200)	$ 19,505	$ (3,340)	$ (104,917)