CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenues	$ 257,941	$ 126,896	$ 503,063	$ 314,001
Cost of revenues	223,573	120,421	437,574	287,223
Gross profit	34,368	6,475	65,489	26,778
Selling, general and administrative expenses	18,039	16,840	33,757	34,799
Goodwill and other impairment	0	150	0	29,017
Operating income (loss)	16,329	(10,515)	31,732	(37,038)
Other (income) expense	(285)	(205)	(941)	536
Interest expense	2,818	5,309	7,859	9,933
Loss on extinguishment of debt	7,155	0	7,155	0
Income (loss) before provision for income taxes	6,641	(15,619)	17,659	(47,507)
Provision (benefit) for income taxes	1,546	(3,122)	4,074	(10,416)
Net income (loss)	$ 5,095	$ (12,497)	$ 13,585	$ (37,091)
Earnings (loss) per Common Share:
Basic (in dollars per share)	$ 0.16	$ (0.40)	$ 0.43	$ (1.20)
Diluted (in dollars per share)	$ 0.16	$ (0.40)	$ 0.42	$ (1.20)
Weighted average shares outstanding:
Basic (in shares)	31,458	30,890	31,361	30,848
Diluted (in shares)	32,674	30,890	32,654	30,848