Condensed Consolidated Statements of Shareholders' Equity Statement - USD ($) $ in Thousands	Total	Additional Paid-in Capital [Member]	Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Value, Issued	$ 234
Additional Paid in Capital, Common Stock	277,518
Retained Earnings (Accumulated Deficit)	236,459
Accumulated Other Comprehensive Income (Loss), Net of Tax	(83,052)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	431,159
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	252
Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, before Tax	$ 33
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	41,370
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	102,344
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 18,579
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | Accounting Standards Update 2016-01 [Member]	(1,395)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(758)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	(99)
Stock Issued During Period, Value, Stock Options Exercised	980	$ 979	$ 1
Stock based compensation	1,556
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	1,556
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	(519)	(519)	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	322
Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, before Tax	(62)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	35,178
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(7,075)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(964)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	183
Stock based compensation	$ 3,511
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	106,792
Common Stock, Par or Stated Value Per Share	$ 0.01
Common Stock, Value, Issued	$ 235
Additional Paid in Capital, Common Stock	279,534
Retained Earnings (Accumulated Deficit)	255,038
Accumulated Other Comprehensive Income (Loss), Net of Tax	(82,514)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	452,293
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	69
Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, before Tax	$ (96)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	25,245
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	100,482
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 16,599
Stock Issued During Period, Value, Stock Dividend	(1,419)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(8,470)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(206)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	282
APIC, Share-based Payment Arrangement, Other, Increase for Cost Recognition	240
Stock Issued During Period, Value, Stock Options Exercised	2,804	2,802	2
Stock based compensation	1,715
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	1,715
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	$ (20)	(20)	0
Common Stock, Par or Stated Value Per Share	$ 0.01
Common Stock, Value, Issued	$ 237
Additional Paid in Capital, Common Stock	284,271
Retained Earnings (Accumulated Deficit)	270,218
Accumulated Other Comprehensive Income (Loss), Net of Tax	(90,908)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	463,818
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), Derivatives Qualifying as Hedges, Tax	4
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)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	2,802
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(13)
Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax	1,869
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	1,869
Stock Issued During Period, Value, Stock Options Exercised	183	183
Stock based compensation	2,071
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	2,071
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	(926)	(927)	$ 1
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	(20)
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), Derivatives Qualifying as Hedges, Net of Tax	69
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	11,940
Stock based compensation	$ 3,989
Common Stock, Par or Stated Value Per Share	$ 0.01
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), Derivatives Qualifying as Hedges, Tax	(24)
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)
Stock Issued During Period, Value, Stock Dividend	(1,433)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	6,631
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	82
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	10,071
APIC, Share-based Payment Arrangement, Other, Increase for Cost Recognition	269
Stock Issued During Period, Value, Stock Options Exercised	243	243
Stock based compensation	1,649
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	1,649
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	$ (54)	$ (54)
Common Stock, Par or Stated Value Per Share	$ 0.01
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