Selected Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income tax expense									$ 1,581	$ (2,519)	$ 3,175
Selected Quarterly Financial Information [Abstract]
Revenues	$ 144,295	$ 164,017	$ 140,301	$ 129,623	$ 161,891	$ 137,061	$ 86,091	$ 81,455	578,236	466,498	385,818
Gross profit	11,657	24,169	16,946	14,710	17,423	8,278	6,025	8,456	67,482	40,182	44,594
Operating (loss) income	(5,283)	9,531	281	(455)	3,231	(8,325)	(2,712)	(193)	4,074	(7,999)	10,262
(Loss) income before income taxes	(6,734)	7,963	(1,310)	(1,958)	1,865	(9,065)	(2,960)	(419)	(2,039)	(10,579)	$ 10,052
Net (loss) income	$ (6,343)	$ 4,739	$ (808)	$ (1,208)	$ 1,439	$ (7,396)	$ (1,845)	$ (258)	$ (3,620)	$ (8,060)
Earnings Per Share, Basic and Diluted [Abstract]
Basic (USD per share)	$ (0.23)	$ 0.17	$ (0.03)	$ (0.04)	$ 0.06	$ (0.27)	$ (0.07)	$ (0.01)	$ (0.13)	$ (0.29)	$ 0.25
Diluted income (loss) per share (USD per share)	$ (0.23)	$ 0.17	$ (0.03)	$ (0.04)	$ 0.06	$ (0.27)	$ (0.07)	$ (0.01)	$ (0.13)	$ (0.29)	$ 0.25
Restatement Adjustment
Income tax expense	$ 800