Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]	Total
Balance (in shares) at Dec. 31, 2014	49,660
Balance, beginning at Dec. 31, 2014	$ 497	$ 154,368	$ (14,588)	$ (5,151)		$ 135,126
Total comprehensive (loss) income			12,954	2,065	(69)	14,950
Stock compensation		2,008				2,008
Excess tax benefit from share-based payments		733				733
Surrender of shares to cover minimum withholding taxes on stock-based compensation		(408)				(408)
Issuance of common stock, pursuant to stock plans, $.01 par (in shares)	870
Issuance of common stock, pursuant to stock plans, $.01 par	$ 8	270				278
Contributions from noncontrolling interest					1,172	1,172
Balance (in shares) at Dec. 31, 2015	50,530
Balance, ending at Dec. 31, 2015	$ 505	156,971	(1,634)	(3,086)	1,103	153,859
Total comprehensive (loss) income			2,386	176	(133)	2,429
Stock compensation		2,830				2,830
Surrender of shares to cover minimum withholding taxes on stock-based compensation		(476)				(476)
Issuance of common stock, pursuant to stock plans, $.01 par (in shares)	947
Issuance of common stock, pursuant to stock plans, $.01 par	$ 10	257				267
Contributions from noncontrolling interest					75	75
Extinguishment of convertible note options		(61)				(61)
Excess tax expense from share-based payments		(47)				(47)
Balance (in shares) at Dec. 31, 2016	51,477
Balance, ending at Dec. 31, 2016	$ 515	159,474	752	(2,910)	1,045	158,876
Total comprehensive (loss) income			(6,101)	939	(129)	(5,291)
Stock compensation		1,509				1,509
Surrender of shares to cover minimum withholding taxes on stock-based compensation		(605)				(605)
Issuance of common stock, pursuant to stock plans, $.01 par (in shares)	1,049
Issuance of common stock, pursuant to stock plans, $.01 par	$ 10	229				239
Contributions from noncontrolling interest					75	75
Extinguishment of convertible note options		(360)				(360)
Cumulative effect of new accounting principles adopted		(1,278)	1,345			67
Reclassification of certain deferred income tax effects			425	(425)
Balance (in shares) at Dec. 31, 2017	52,526
Balance, ending at Dec. 31, 2017	$ 525	$ 158,969	$ (3,579)	$ (2,396)	$ 991	$ 154,510