Condensed Consolidated Statements of Shareholders' Equity Statement - USD ($) $ in Thousands	Total	Director	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Director	Common Stock [Member]	Common Stock [Member] Director	Retained Earnings	Retained Earnings Director	AOCI Attributable to Parent	AOCI Attributable to Parent Director
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Value, Issued	$ 238
Additional Paid in Capital, Common Stock	287,256
Retained Earnings (Accumulated Deficit)	290,441
Accumulated Other Comprehensive Income (Loss), Net of Tax	(114,350)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	463,585
Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, before Tax	$ (537)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	68,369
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	11,236
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (2,969)		$ 0		$ 0		$ (2,969)		$ 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax			0		0		0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | Accounting Standards Update 2016-01 [Member]	(2,802)								(2,802)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	(13)		0		0		0		(13)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	1,869		0		0		0		1,869
Stock Issued During Period, Value, Stock Options Exercised	183		183		0		0		0
Stock based compensation	2,071		2,071		0		0		0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	(926)		(927)		(1)		0		0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	4
Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, before Tax	(3,339)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(7,073)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	9,433
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	69
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	11,940
Stock based compensation	3,989
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	(20)
Common Stock, Value, Issued	239
Additional Paid in Capital, Common Stock	288,583
Retained Earnings (Accumulated Deficit)	287,472
Accumulated Other Comprehensive Income (Loss), Net of Tax	(109,692)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	466,602
Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, before Tax	$ (2,817)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	35,023
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	12,220
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (4,104)		0		0		(4,104)		0
Stock Issued During Period, Value, Stock Dividend	(1,433)		0		0				0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	6,631		0		0		0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	82		0		0		0		82
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	10,071		0		0		0		10,071
Stock Issued During Period, Value, Stock Options Exercised	243		243				0		0
Stock based compensation	1,649		1,649		0		0		0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	(54)		(54)		0		0		0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	269			$ 269		$ 0		$ 0		$ 0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	(24)
Common Stock, Value, Issued	239
Additional Paid in Capital, Common Stock	290,690
Retained Earnings (Accumulated Deficit)	281,935
Accumulated Other Comprehensive Income (Loss), Net of Tax	(92,908)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	479,956
Common Stock, Value, Issued					240
Additional Paid in Capital, Common Stock			296,093
Retained Earnings (Accumulated Deficit)							293,802
Accumulated Other Comprehensive Income (Loss), Net of Tax	(59,986)								(59,986)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	530,149
Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, before Tax	$ 34
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	58,081
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	12,682
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (7,263)		0		0		(7,263)		0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	2,076		0		0		0		2,076
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	96		0		0		0		96
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	(97)		0		0		0		(97)
Payments of Stock Issuance Costs	8,340
Proceeds from Other Equity	198,705		198,662		43		0		0
Stock Issued During Period, Value, Stock Options Exercised	290		290		0		0		0
Stock based compensation	2,262		2,262		0		0		0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	(1,765)		(1,766)		1		0		0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	(31)
Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, before Tax	(40)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	7,940
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(2,150)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	(2,899)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	115
Stock based compensation	5,504
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	955
Common Stock, Value, Issued			284
Additional Paid in Capital, Common Stock			495,541
Retained Earnings (Accumulated Deficit)							286,539
Accumulated Other Comprehensive Income (Loss), Net of Tax	(57,911)								(57,911)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	724,453
Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, before Tax	$ (74)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	32,665
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	38,744
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 15,203		0		0		15,203		0
Stock Issued During Period, Value, Stock Dividend	(1,706)		0		0		(1,706)		0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(4,226)		0		0		0		(4,226)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	(2,995)		0		0		0		(2,995)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	212		0		0		0		212
Proceeds from Other Equity	198,705
Stock Issued During Period, Value, Stock Options Exercised	1,122		1,122		0		0		0
Stock based compensation	2,762	$ 480	2,762	$ 480	0	$ 0	0	$ 0	0	$ 0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	(147)		$ (147)		$ 0		$ 0		$ 0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	986
Common Stock, Value, Issued	284
Additional Paid in Capital, Common Stock	499,758
Retained Earnings (Accumulated Deficit)	300,036
Accumulated Other Comprehensive Income (Loss), Net of Tax	(64,920)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 735,158