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, 2013	$ 235,507	$ 20,313	$ 266,276	$ 2,427	$ (53,509)
Ending balance, shares at Dec. 31, 2013		33,572,778
Stockholders' Equity [Roll Forward]
Net income (loss)	(8,681)	$ 0	0	0	(8,681)
Issuances under option plans	$ 2,792	$ 138	2,654	0	0
Issuances under option plans, shares	228,064	227,664
Dividend reinvestment plan	$ 134	$ 4	130	0	0
Dividend reinvestment plan, shares		7,159
Restricted stock vested	0	$ 75	(75)	0	0
Restricted stock vested, shares		123,829
Restricted stock and stock option grants	2,835	$ 10	2,825	0	0
Restricted stock and stock option grants (shares)		15,055
Tax benefit from options	679	$ 0	679	0	0
Foreign currency translation adjustment	(13,318)	0	0	(13,318)	0
Repurchase of common stock	(54,897)	$ (1,660)	(53,237)	0	0
Repurchase of common stock (shares)		(2,742,506)
Stock contributions	200	$ 6	194	0	0
Stock contributions, shares		9,376
Shares withheld for employee taxes on equity awards	(1,083)	$ (31)	(1,052)	0	0
Shares withheld for employee taxes on equity awards, shares		(50,393)
Declared dividends	(16,800)	$ 0	0	0	(16,800)
Pension liability, net of tax expense (benefit) of ($95) in 2016, $113 in 2015 and ($448) in 2014	(797)	0	0	(797)	0
Ending balance at Dec. 31, 2014	146,571	$ 18,855	218,394	(11,688)	(78,990)
Ending 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 expense (benefit) of ($95) in 2016, $113 in 2015 and ($448) in 2014	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	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 expense (benefit) of ($95) in 2016, $113 in 2015 and ($448) in 2014	(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