CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Noncontrolling Interest
Beginning Balance (in shares) at Dec. 31, 2012		30,902,000
Beginning Balance at Dec. 31, 2012	$ 209,123	$ 3	$ 244,924	$ (3,082)	$ (32,722)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)		2,362.000
Vesting of restricted stock (in shares)		180,613.000
Vesting of restricted stock	(300)	$ 0	(300)
Tax deficit of share-based compensation	(399)		(399)
Equity compensation	2,100		2,100
Foreign currency translation adjustment, net of deferred taxes	(224)			(224)
Reclassification of currency translation adjustments	2,336			2,336
Net income	(51,969)				(51,969)
Ending Balance (in shares) at Dec. 31, 2013		31,085,000
Ending Balance at Dec. 31, 2013	160,667	$ 3	246,325	(970)	(84,691)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)		66,119.000
Vesting of restricted stock (in shares)		141,188.000
Vesting of restricted stock	(245)		(245)
Equity compensation	1,387		1,387
Foreign currency translation adjustment, net of deferred taxes	(148)			(148)
Acquisition	324					324
Reclassification of currency translation adjustments	0
Distribution to noncontrolling shareholder	(119)					(119)
Net income	(31,534)				(31,783)	249
Ending Balance (in shares) at Dec. 31, 2014		31,292,000
Ending Balance at Dec. 31, 2014	$ 130,332	$ 3	247,467	(1,118)	(116,474)	454
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)	293,625	119,000
Vesting of restricted stock (in shares)		191,000
Vesting of restricted stock	$ (543)		(543)
Equity compensation	2,460		2,460
Foreign currency translation adjustment, net of deferred taxes	(89)			(89)
Acquisition of Mediscan (in shares)		350,000
Acquisition of Mediscan	4,724		4,724
Reclassification of currency translation adjustments	0
Distribution to noncontrolling shareholder	(494)					(494)
Net income	4,954				4,418	536
Ending Balance (in shares) at Dec. 31, 2015		31,952,000
Ending Balance at Dec. 31, 2015	$ 141,344	$ 3	$ 254,108	$ (1,207)	$ (112,056)	$ 496