Selected Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ 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
Selected Quarterly Financial Information [Abstract]
Revenues	$ 199,793	$ 199,507	$ 165,985	$ 143,105	$ 99,211	$ 125,073	$ 159,767	$ 136,843	$ 708,390	$ 520,894	$ 578,553
Gross profit	19,089	20,893	14,977	9,082	(22,206)	4,825	19,462	14,695	64,041	16,776	62,240
Operating (loss) income	2,701	6,092	(423)	(6,177)	(104,795)	(7,405)	4,591	7,069	2,193	(100,540)	1,538
(Loss) income before income taxes	1,107	4,506	(1,773)	(7,331)	(106,727)	(9,427)	3,909	5,590	(3,491)	(106,655)	(4,141)
Net (loss) income	$ 159	$ 4,039	$ (1,633)	$ (7,924)	$ (94,416)	$ (6,356)	$ 2,249	$ 4,101	$ (5,359)	$ (94,422)	$ 400
Earnings Per Share, Basic and Diluted [Abstract]
Basic (USD per share)	$ 0.01	$ 0.14	$ (0.06)	$ (0.27)	$ (3.32)	$ (0.22)	$ 0.08	$ 0.15	$ (0.18)	$ (3.31)	$ 0.01
Diluted (loss) income per share (in dollars per share)	$ 0.01	$ 0.14	$ (0.06)	$ (0.27)	$ (3.32)	$ (0.22)	$ 0.08	$ 0.14	$ (0.18)	$ (3.31)	$ 0.01