Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]
Beginning balance, shares at Dec. 31, 2012		29,162
Beginning balance at Dec. 31, 2012	$ 124,933	$ 2,913	$ 267,623	$ (158,134)	$ 12,531
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, shares		67
Common stock issued under employee benefit plans	412	$ 7	405
Share-based compensation, shares		359
Share-based compensation	3,980	$ 36	3,944
Repurchase and cancellation of restricted shares, shares		(25)
Repurchase and cancellation of restricted shares	47	$ 3	44
Net income (loss)	6,340			6,340
Other Comprehensive Income
Foreign currency translation adjustment	2,428				2,428
Pension adjustment, net of tax provision (benefit)	2,164				2,164
Ending balance, shares at Dec. 31, 2013		29,563
Ending balance at Dec. 31, 2013	140,210	$ 2,953	271,928	(151,794)	17,123
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, shares		175
Common stock issued under employee benefit plans	1,450	$ 18	1,432
Share-based compensation, shares		312
Share-based compensation	3,964	$ 31	3,933
Repurchase and cancellation of restricted shares, shares		(204)
Repurchase and cancellation of restricted shares	1	$ 20	21
Net income (loss)	(6,272)			(6,272)
Other Comprehensive Income
Foreign currency translation adjustment	(10,445)				(10,445)
Pension adjustment, net of tax provision (benefit)	(1,955)				(1,955)
Ending balance, shares at Dec. 31, 2014		29,846
Ending balance at Dec. 31, 2014	126,953	$ 2,982	277,314	(158,066)	4,723
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under employee benefit plans, shares		142
Common stock issued under employee benefit plans	875	$ 14	861
Share-based compensation, shares		80
Share-based compensation	3,946	$ 8	3,938
Proceeds from issuance of common stock, shares		1,831
Proceeds from issuance of common stock, net	9,564	$ 183	9,381
Cancellation of restricted shares, shares		(117)
Cancellation of restricted shares	0	$ 11	11
Net income (loss)	(22,333)			(22,333)
Other Comprehensive Income
Foreign currency translation adjustment	1,574				1,574
Pension adjustment, net of tax provision (benefit)	(1,403)				(1,403)
Ending balance, shares at Dec. 31, 2015		31,782
Ending balance at Dec. 31, 2015	$ 119,176	$ 3,176	$ 291,505	$ (180,399)	$ 4,894