Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Deficit
Balance at Dec. 31, 2012	$ 230,022	$ 20,316	$ 266,419	$ 10,643	$ (67,356)
Balance, shares at Dec. 31, 2012		33,480,189
Stockholders' Equity [Roll Forward]
Net income (loss)	26,002	$ 0	0	0	26,002
Issuances under option plans	$ 5,693	$ 299	5,394	0	0
Issuances under option plans, shares	503,321	503,321
Dividend reinvestment plan	$ 113	$ 4	109	0	0
Dividend reinvestment plan, shares		7,390
Restricted stock vested	0	$ 0	0	0	0
Restricted stock vested, shares		112,000
Restricted stock and stock option grants	2,237	$ 0	2,237	0	0
Restricted stock and stock option grants (shares)		33,152
Tax benefit from options	389	$ 0	389	0	0
Foreign currency translation adjustment	(9,292)	0	0	(9,292)	0
Repurchase of common stock	(8,096)	$ (314)	(7,782)	0	0
Repurchase of common stock (shares)		(530,983)
Stock contributions	202	$ 8	194	0	0
Stock contributions, shares		12,682
Shares withheld for employee taxes on equity awards	(684)	$ 0	(684)	0	0
Shares withheld for employee taxes on equity awards, shares		(44,973)
Declared dividends	(12,155)	$ 0	0	0	(12,155)
Pension liability, net of tax expense (benefit) of $113 in 2015, ($448) in 2014 and $605 in 2013	1,076	0	0	1,076	0
Balance at Dec. 31, 2013	235,507	$ 20,313	266,276	2,427	(53,509)
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 $113 in 2015, ($448) in 2014 and $605 in 2013	(797)	0	0	(797)	0
Balance at Dec. 31, 2014	$ 146,571	$ 18,855	218,394	(11,688)	(78,990)
Balance, shares at Dec. 31, 2014	31,162,962	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 $113 in 2015, ($448) in 2014 and $605 in 2013	200	0	0	200	0
Balance at Dec. 31, 2015	$ 97,703	$ 17,895	$ 196,743	$ (39,110)	$ (77,825)
Balance, shares at Dec. 31, 2015	29,521,566	29,521,566