CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Loss, net [Member]	(Accumulated Deficit) Retained Earnings [Member]	Noncontrolling Interest in Subsidiary [Member]
Beginning Balance (in shares) at Dec. 31, 2017		35,838,000
Beginning Balance at Dec. 31, 2017	$ 237,719	$ 4	$ 305,362	$ (1,166)	$ (67,111)	$ 630
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of share options (in shares)		16,000
Vesting of restricted stock and performance stock awards (in shares)		151,000
Vesting of restricted stock and performance stock awards	(692)		(692)
Equity compensation	1,383		1,383
Stock repurchase and retirement (in shares)		(399,456)
Stock repurchase and retirement	(4,700)		(4,700)
Foreign currency translation adjustment, net of taxes	(72)			(72)
Net change in hedging transaction, net of taxes	78			78
Distribution to noncontrolling shareholder	(590)					(590)
Net (loss) income	3,745				3,181	564
Ending Balance (in shares) at Jun. 30, 2018		35,606,000
Ending Balance at Jun. 30, 2018	236,871	$ 4	301,353	(1,160)	(63,930)	604
Beginning Balance (in shares) at Mar. 31, 2018		35,706,000
Beginning Balance at Mar. 31, 2018	236,101	$ 4	302,325	(1,360)	(65,469)	601
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of share options (in shares)		8,000
Vesting of restricted stock and performance stock awards (in shares)		49,000
Vesting of restricted stock and performance stock awards	(71)		(71)
Equity compensation	914		914
Stock repurchase and retirement (in shares)		(157,000)
Stock repurchase and retirement	(1,815)		(1,815)
Foreign currency translation adjustment, net of taxes	(49)			(49)
Net change in hedging transaction, net of taxes	249			249
Distribution to noncontrolling shareholder	(282)					(282)
Net (loss) income	1,824				1,539	285
Ending Balance (in shares) at Jun. 30, 2018		35,606,000
Ending Balance at Jun. 30, 2018	236,871	$ 4	301,353	(1,160)	(63,930)	604
Beginning Balance (in shares) at Dec. 31, 2018		35,626,000
Beginning Balance at Dec. 31, 2018	218,198	$ 4	303,048	(1,462)	(84,062)	670
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of share options (in shares)		9,000
Vesting of restricted stock and performance stock awards (in shares)		225,000
Vesting of restricted stock and performance stock awards	(788)		(788)
Equity compensation	1,535		1,535
Stock repurchase and retirement (in shares)		0
Foreign currency translation adjustment, net of taxes	72			72
Net change in hedging transaction, net of taxes	(945)			(945)
Distribution to noncontrolling shareholder	(738)					(738)
Net (loss) income	(52,646)				(53,441)	795
Ending Balance (in shares) at Jun. 30, 2019		35,860,000
Ending Balance at Jun. 30, 2019	164,688	$ 4	303,795	(2,335)	(137,503)	727
Beginning Balance (in shares) at Mar. 31, 2019		35,806,000
Beginning Balance at Mar. 31, 2019	216,010	$ 4	302,802	(1,661)	(85,829)	694
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of share options (in shares)		5,000
Vesting of restricted stock and performance stock awards (in shares)		49,000
Vesting of restricted stock and performance stock awards	(11)		(11)
Equity compensation	1,004		1,004
Foreign currency translation adjustment, net of taxes	19			19
Net change in hedging transaction, net of taxes	(693)			(693)
Distribution to noncontrolling shareholder	(371)					(371)
Net (loss) income	(51,270)				(51,674)	404
Ending Balance (in shares) at Jun. 30, 2019		35,860,000
Ending Balance at Jun. 30, 2019	$ 164,688	$ 4	$ 303,795	$ (2,335)	$ (137,503)	$ 727