Selected Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Selected Quarterly Financial Information [Abstract]
Revenues	$ 161,891	$ 137,061	$ 86,091	$ 81,455	$ 107,333	$ 106,976	$ 90,251	$ 81,258	$ 466,498	$ 385,818	$ 354,544
Gross profit	17,423	8,278	6,025	8,456	18,168	12,906	5,873	7,647	40,182	44,594	32,004
Operating (loss) income	1,690	(6,218)	(2,769)	(236)	7,429	5,047	(2,256)	(317)	(7,533)	9,903	(106)
(Loss) income before income taxes	1,865	(9,065)	(2,960)	(419)	7,457	4,838	(1,899)	(344)	(10,579)	10,052	(606)
Net (loss) income	1,439	(7,396)	(1,845)	(258)	5,288	2,962	(1,163)	(210)	(8,060)	6,877
Net (loss) income attributable to common stockholders	$ 1,439	$ (7,396)	$ (1,845)	$ (258)	$ 5,288	$ 2,962	$ (1,163)	$ (210)	$ (8,060)	$ 6,877	$ 331
Earnings Per Share, Basic and Diluted [Abstract]
Basic (USD per share)	$ 0.06	$ (0.27)	$ (0.07)	$ (0.01)	$ 0.19	$ 0.11	$ (0.04)	$ (0.01)	$ (0.29)	$ 0.25	$ 0.01
Diluted income (loss) per share (USD per share)	$ 0.06	$ (0.27)	$ (0.07)	$ (0.01)	$ 0.19	$ 0.11	$ (0.04)	$ (0.01)	$ (0.29)	$ 0.25	$ 0.01