UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Accumulated Foreign Currency Adjustment Attributable to Parent [Member]	Retained Earnings [Member]	Parent [Member]	Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 79,173
Shares, Outstanding at Dec. 31, 2017		37,341
Accumulated other comprehensive income (loss), beginning of period at Dec. 31, 2017		$ 37	$ 638,727	$ (59,547)		$ (500,044)	$ 79,173	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		223
Stock Issued During Period, Value, Stock Options Exercised	(232)		(232)				(232)
Unrealized investment holding gains (losses), net of reclassification adjustments	1				$ 1		1
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	1,157		1,157				1,157
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	396				396		396
Net loss	(5,178)					(5,178)	(5,178)
Net Income (Loss) Attributable to Noncontrolling Interest	0
Shares, Outstanding at Mar. 31, 2018		37,564
Accumulated other comprehensive loss balance, end of period at Mar. 31, 2018		$ 37	639,652	(59,150)		(504,197)	76,342	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(5,178)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	76,342
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	56,840
Shares, Outstanding at Dec. 31, 2018		37,728
Accumulated other comprehensive income (loss), beginning of period at Dec. 31, 2018	56,840	$ 37	641,930	(61,118)		(524,009)	56,840	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		190
Stock Issued During Period, Value, Stock Options Exercised	(271)		(271)				(271)
Adjustments to Additional Paid in Capital, Other	(776)		(1,346)				(1,346)	570
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	1,384		1,384				1,384
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(87)				$ (87)		(87)
Net loss	1,533					1,533	1,533
Net Income (Loss) Attributable to Noncontrolling Interest								(319)
Stockholders' Equity, Other	450		362				362	88
Shares, Outstanding at Mar. 31, 2019		37,918
Accumulated other comprehensive loss balance, end of period at Mar. 31, 2019	58,415	$ 37	$ 642,059	$ (61,205)		$ (522,476)	$ 58,415	$ 339
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	1,214
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 58,754