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)		19,000
Vesting of restricted stock and performance stock awards (in shares)		156,000
Vesting of restricted stock and performance stock awards	(719)		(719)
Equity compensation	2,364		2,364
Stock repurchase and retirement (in shares)		(432,439)
Stock repurchase and retirement	(5,000)		(5,000)
Foreign currency translation adjustment, net of taxes	(143)			(143)
Net change in hedging transaction, net of taxes	276			276
Distribution to noncontrolling shareholder	(868)					(868)
Net (loss) income	3,626				2,740	886
Ending Balance (in shares) at Sep. 30, 2018		35,581,000
Ending Balance at Sep. 30, 2018	237,255	$ 4	302,007	(1,033)	(64,371)	648
Beginning Balance (in shares) at Jun. 30, 2018		35,606,000
Beginning Balance at Jun. 30, 2018	236,871	$ 4	301,353	(1,160)	(63,930)	604
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of share options (in shares)		3,000
Vesting of restricted stock and performance stock awards (in shares)		5,000
Vesting of restricted stock and performance stock awards	(27)		(27)
Equity compensation	981		981
Stock repurchase and retirement (in shares)		(33,000)
Stock repurchase and retirement	(300)		(300)
Foreign currency translation adjustment, net of taxes	(70)			(70)
Net change in hedging transaction, net of taxes	197			197
Distribution to noncontrolling shareholder	(279)					(279)
Net (loss) income	(118)				(441)	323
Ending Balance (in shares) at Sep. 30, 2018		35,581,000
Ending Balance at Sep. 30, 2018	237,255	$ 4	302,007	(1,033)	(64,371)	648
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)		10,000
Vesting of restricted stock and performance stock awards (in shares)		231,000
Vesting of restricted stock and performance stock awards	(801)		(801)
Equity compensation	2,517		2,517
Stock repurchase and retirement (in shares)		0
Foreign currency translation adjustment, net of taxes	43			43
Net change in hedging transaction, net of taxes	175			175
Distribution to noncontrolling shareholder	(1,142)					(1,142)
Net (loss) income	(55,343)				(56,569)	1,226
Ending Balance (in shares) at Sep. 30, 2019		35,867,000
Ending Balance at Sep. 30, 2019	163,647	$ 4	304,764	(1,244)	(140,631)	754
Beginning Balance (in shares) at Jun. 30, 2019		35,860,000
Beginning Balance at Jun. 30, 2019	164,688	$ 4	303,795	(2,335)	(137,503)	727
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of share options (in shares)		2,000
Vesting of restricted stock and performance stock awards (in shares)		5,000
Vesting of restricted stock and performance stock awards	(13)		(13)
Equity compensation	982		982
Foreign currency translation adjustment, net of taxes	(29)			(29)
Net change in hedging transaction, net of taxes	1,120			1,120
Distribution to noncontrolling shareholder	(404)					(404)
Net (loss) income	(2,697)				(3,128)	431
Ending Balance (in shares) at Sep. 30, 2019		35,867,000
Ending Balance at Sep. 30, 2019	$ 163,647	$ 4	$ 304,764	$ (1,244)	$ (140,631)	$ 754