Quarterly Financial Data (Unaudited) (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
Quarterly Financial Data [Abstract]
Revenue	$ 70,604	$ 64,337	$ 64,079	$ 63,812	$ 63,863	$ 74,048	$ 71,949	$ 60,106	$ 262,832	$ 269,966	$ 319,852
Gross margin	22,812	22,354	21,718	23,794	24,609	27,339	24,552	19,806	90,678	96,306	130,764
Income from continuing operations	3,917	(1,870)	(111)	(29)	1,314	3,589	2,770	(515)	1,907	7,158	39,622
(Loss) income from discontinued operations, net of tax	(17,836)	(876)	(2,169)	(30,156)	(2,689)	(1,614)	(15,317)	(1,000)	(51,037)	(20,620)	13,981
Net (loss) income	$ (13,919)	$ (2,746)	$ (2,280)	$ (30,185)	$ (1,375)	$ 1,975	$ (12,547)	$ (1,515)	$ (49,130)	$ (13,462)	$ 53,603
Basic earnings (loss) per common share:
Continuing operations (in dollars per share)	$ 0.07	$ (0.03)	$ 0.00	$ 0.00	$ 0.02	$ 0.07	$ 0.05	$ (0.01)	$ 0.03	$ 0.13	$ 0.73
Discontinued operations (in dollars per share)	(0.31)	(0.02)	(0.04)	(0.55)	(0.05)	(0.03)	(0.28)	(0.02)	(0.91)	(0.38)	0.26
Basic earnings (loss) per common share (in dollars per share)	(0.24)	(0.05)	(0.04)	(0.55)	(0.03)	0.04	(0.23)	(0.03)	(0.88)	(0.25)	0.99
Diluted earnings (loss) per common share:
Continuing operations (in dollars per share)	0.07	(0.03)	0.00	0.00	0.02	0.07	0.05	(0.01)	0.03	0.13	0.71
Discontinued operations (in dollars per share)	(0.31)	(0.02)	(0.04)	(0.55)	(0.05)	(0.03)	(0.28)	(0.02)	(0.91)	(0.37)	0.25
Diluted earnings (loss) per common share (in dollars per share)	$ (0.24)	$ (0.05)	$ (0.04)	$ (0.55)	$ (0.03)	$ 0.04	$ (0.23)	$ (0.03)	$ (0.88)	$ (0.24)	$ 0.96