Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Data [Abstract]
Revenue	$ 72,509	$ 79,458	$ 85,177	$ 79,954	$ 70,604	$ 64,337	$ 64,079	$ 63,812	$ 317,098	$ 262,832	$ 269,966
Income (loss) from operations	2,123	(3,103)	(1,252)	(623)	(5,575)	(2,253)	156	368	(2,855)	(7,304)	12,278
Income (loss) from continuing operations	(7,767)	(3,421)	(1,122)	(743)	3,917	(1,870)	(111)	(29)	(13,053)	1,907	7,158
Loss from discontinued operations, net of tax	(722)	319	(2,704)	(11,235)	(17,836)	(876)	(2,169)	(30,156)	(14,342)	(51,037)	(20,620)
Net loss	$ (8,489)	$ (3,102)	$ (3,826)	$ (11,978)	$ (13,919)	$ (2,746)	$ (2,280)	$ (30,185)	$ (27,395)	$ (49,130)	$ (13,462)
Basic earnings (loss) per common share:
Continuing operations (in dollars per share)	$ (0.14)	$ (0.06)	$ (0.02)	$ (0.01)	$ 0.07	$ (0.03)	$ 0.00	$ 0.00	$ (0.23)	$ 0.03	$ 0.13
Discontinued operations (in dollars per share)	(0.01)	0.01	(0.05)	(0.19)	(0.31)	(0.02)	(0.04)	(0.55)	(0.25)	(0.91)	(0.38)
Basic earnings (loss) per common share (in dollars per share)	(0.15)	(0.05)	(0.07)	(0.20)	(0.24)	(0.05)	(0.04)	(0.55)	(0.48)	(0.88)	(0.25)
Diluted earnings (loss) per common share:
Continuing operations (in dollars per share)	(0.14)	(0.06)	(0.02)	(0.01)	0.07	(0.03)	0.00	0.00	(0.23)	0.03	0.13
Discontinued operations (in dollars per share)	(0.01)	0.01	(0.05)	(0.19)	(0.31)	(0.02)	(0.04)	(0.55)	(0.25)	(0.91)	(0.37)
Diluted earnings (loss) per common share (in dollars per share)	$ (0.15)	$ (0.05)	$ (0.07)	$ (0.20)	$ (0.24)	$ (0.05)	$ (0.04)	$ (0.55)	$ (0.48)	$ (0.88)	$ (0.24)