Unaudited Condensed Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Accumulated Deficit)	Non-controlling Interests
Beginning balance (in shares) at Dec. 31, 2017		60,623,000	3,621,000
Beginning balance at Dec. 31, 2017	$ 265,258	$ 6	$ (33,064)	$ 336,067	$ (884)	$ (37,225)	$ 358
Increase (Decrease) in Equity [Roll Forward]
Net income	67					67
Foreign currency translation adjustment	(179)				(179)
Stock issued under employee stock purchase plan (in shares)			(28,000)
Stock issued under employee stock purchase plan	146			146
Restricted stock granted (in shares)		538,000
Restricted stock forfeited (in shares)			5,000
Treasury stock purchased (in shares)			1,000
Treasury stock purchased	(3)		$ (3)
Stock compensation expense	1,924			1,924
Ending balance (in shares) at Mar. 31, 2018		61,161,000	3,599,000
Ending balance at Mar. 31, 2018	267,213	$ 6	$ (33,067)	338,137	(1,063)	(37,158)	358
Beginning balance (in shares) at Dec. 31, 2018		62,163,000	3,770,000
Beginning balance at Dec. 31, 2018	201,624	$ 6	$ (33,237)	343,536	(1,116)	(107,565)	0
Increase (Decrease) in Equity [Roll Forward]
Net income	32,992					32,992
Foreign currency translation adjustment	$ 94				94
Restricted stock granted (in shares)	36,037	36,000
Restricted stock forfeited (in shares)			34,000
Treasury stock purchased (in shares)			41,000
Treasury stock purchased	$ (131)		$ (131)
Stock compensation expense	468			468
Ending balance (in shares) at Mar. 31, 2019		62,199,000	3,845,000
Ending balance at Mar. 31, 2019	$ 235,047	$ 6	$ (33,368)	$ 344,004	$ (1,022)	$ (74,573)	$ 0