Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Deficit [Member]
Beginning balance at Dec. 31, 2014	$ 146,571	$ 18,855	$ 218,394	$ (11,688)	$ (78,990)
Beginning balance, shares at Dec. 31, 2014		31,162,962
Stockholders' Equity [Roll Forward]
Net income (loss)	17,762	$ 0	0	0	17,762
Issuances under option plans	$ 2,775	$ 162	2,613	0	0
Issuances under option plans, shares	239,508	239,908
Dividend reinvestment plan	$ 149	$ 5	144	0	0
Dividend reinvestment plan, shares		8,968
Restricted stock vested	0	$ 78	(78)	0	0
Restricted stock vested, shares		120,723
Restricted stock and stock option grants	5,277	$ 0	5,277	0	0
Restricted stock and stock option grants (shares)		0
Tax benefit from options	38	$ 0	38	0	0
Foreign currency translation adjustment	(27,622)	0	0	(27,622)	0
Repurchase of common stock	(30,023)	$ (1,193)	(28,830)	0	0
Repurchase of common stock (shares)		(1,992,379)
Stock contributions	148	$ 5	143	0	0
Stock contributions, shares		8,250
Shares withheld for employee taxes on equity awards	(975)	$ (17)	(958)	0	0
Shares withheld for employee taxes on equity awards, shares		(26,866)
Declared dividends	(16,597)	$ 0	0	0	(16,597)
Pension liability, net of tax	200	0	0	200	0
Ending balance at Dec. 31, 2015	97,703	$ 17,895	196,743	(39,110)	(77,825)
Ending balance, shares at Dec. 31, 2015		29,521,566
Stockholders' Equity [Roll Forward]
Net income (loss)	1,057	$ 0	0	0	1,057
Issuances under option plans	$ 3,235	$ 205	3,030	0	0
Issuances under option plans, shares	334,836	374,958
Dividend reinvestment plan	$ 139	$ 6	133	0	0
Dividend reinvestment plan, shares		10,520
Restricted stock vested	0	$ 104	(104)	0	0
Restricted stock vested, shares		169,929
Stock compensation expense	3,357	$ 24	3,333	0	0
Tax benefit from options	64	0	64	0	0
Foreign currency translation adjustment	5,105	0	0	5,105	0
Shares withheld for employee taxes on equity awards	(1,166)	$ 0	(1,166)	0	0
Shares withheld for employee taxes on equity awards, shares		(57,412)
Declared dividends	(16,292)	$ 0	0	0	(16,292)
Pension liability, net of tax	(169)	0	0	(169)	0
Ending balance at Dec. 31, 2016	$ 93,033	$ 18,234	202,033	(34,174)	(93,060)
Ending balance, shares at Dec. 31, 2016	30,019,561	30,019,561
Stockholders' Equity [Roll Forward]
Net income (loss)	$ (9,889)	$ 0	0	0	(9,889)
Issuances under option plans	$ 4,396	$ 229	4,167	0	0
Issuances under option plans, shares	375,292	375,292
Dividend reinvestment plan	$ 131	$ 5	126	0	0
Dividend reinvestment plan, shares		7,625
Restricted stock vested	0	$ 79	(79)	0	0
Restricted stock vested, shares		130,036
Stock compensation expense	3,626	$ 0	3,626	0	0
Foreign currency translation adjustment	2,391	0	0	2,391	0
Shares withheld for employee taxes on equity awards	(620)	$ 0	(620)	0	0
Shares withheld for employee taxes on equity awards, shares		(36,777)
Declared dividends	(16,558)	$ 0	0	0	(16,558)
Pension liability, net of tax	41	0	0	41	0
Reclassification adjustment for foreign currency translation included in net income (loss)	17,201	0	0	17,201	0
Ending balance at Dec. 31, 2017	$ 93,752	$ 18,547	$ 209,253	$ (14,541)	$ (119,507)
Ending balance, shares at Dec. 31, 2017	30,495,737	30,495,737