CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ 16,071	$ 6,815	$ 31,054	$ (15,748)	$ 18,750	$ 5,691	$ 10,035	$ (6,951)	$ 38,192	$ 27,525	$ (858)
Other comprehensive loss:
Unrealized loss on cash flow hedges, net of tax benefit of ($2,103), ($2,278), and ($922), respectively	1,299	1,542	(573)	(8,902)	2,064	(1,641)	(4,688)	(2,936)	(6,634)	(7,201)	(2,936)
Unrealized (loss) gain on defined benefit plan, net of tax (benefit) provision of ($326), ($259), and $142, respectively	(1,114)	28	27	29	(838)	7	6	6	(1,030)	(819)	454
Total other comprehensive loss									(7,664)	(8,020)	(2,482)
Comprehensive income (loss)	$ 16,256	$ 8,385	$ 30,508	$ (24,621)	$ 19,976	$ 4,057	$ 5,353	$ (9,881)	$ 30,528	$ 19,505	$ (3,340)