Condensed Consolidated Statements of Shareholders' Equity Statement - USD ($)	Total	Additional Paid-in Capital [Member]	Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common Stock, Value, Issued	$ 230,000
Additional Paid in Capital, Common Stock	269,360,000
Retained Earnings (Accumulated Deficit)	197,897,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(59,258,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 408,229,000
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	14,410
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	161,912
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 7,706,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(11,246,000)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(165,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	613,000
Stock Issued During Period, Value, Stock Options Exercised	3,641,000	$ 3,639,000	$ 2,000
Stock based compensation	1,334,000
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	1,334,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	(544,000)	(544,000)	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	206,000
Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, before Tax	(249,000)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	22,836,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(14,802,000)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(619,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	725,000
Stock based compensation	$ 4,625,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	212,000
Common Stock, Value, Issued	$ 232,000
Additional Paid in Capital, Common Stock	273,789,000
Retained Earnings (Accumulated Deficit)	206,491,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(70,944,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 409,568,000
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	434
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	3,896
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 15,912,000
Stock Issued During Period, Value, Stock Dividend	(1,164,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(1,320,000)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(543,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	26,000
APIC, Share-based Payment Arrangement, Other, Increase for Cost Recognition	210,000
Stock Issued During Period, Value, Stock Options Exercised	67,000	67,000
Stock based compensation	1,550,000
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	1,550,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	$ (21,000)	(22,000)	1,000
Common Stock, Par or Stated Value Per Share	$ 0.01
Common Stock, Value, Issued	$ 233,000
Additional Paid in Capital, Common Stock	275,594,000
Retained Earnings (Accumulated Deficit)	221,239,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(72,781,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	424,285,000
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-01 [Member]	(888,000)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	(30,000)
Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, before Tax	$ (30,000)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	35,469
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (782,000)
Stock Issued During Period, Value, Stock Dividend	(1,168,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(2,236,000)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	89,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	86,000
APIC, Share-based Payment Arrangement, Other, Increase for Cost Recognition	110,000
Stock Issued During Period, Value, Stock Options Exercised		1,421,000
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	1,421,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	$ (1,374,000)	(1,375,000)	1,000
Common Stock, Par or Stated Value Per Share	$ 0.01
Common Stock, Value, Issued	$ 234,000
Additional Paid in Capital, Common Stock	275,750,000
Retained Earnings (Accumulated Deficit)	219,289,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(74,842,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	420,431,000
Common Stock, Value, Issued	234,000
Additional Paid in Capital, Common Stock	277,518,000
Retained Earnings (Accumulated Deficit)	236,459,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(83,052,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 431,159,000
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	$ 18,579,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	1,395,000
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(758,000)
Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax	(99,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	(99,000)
Stock Issued During Period, Value, Stock Options Exercised	980,000	979,000	1,000
Stock based compensation	1,556,000
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	1,556,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	(519,000)	(519,000)	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	34,000
Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, before Tax	3,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	50,428,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(1,596,000)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(102,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	(10,000)
Stock based compensation	3,510,000
Common Stock, Value, Issued	235,000
Additional Paid in Capital, Common Stock	279,534,000
Retained Earnings (Accumulated Deficit)	255,038,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(82,514,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 452,293,000
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	$ 16,599,000
Stock Issued During Period, Value, Stock Dividend	(1,419,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(8,470,000)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(206,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	282,000
APIC, Share-based Payment Arrangement, Other, Increase for Cost Recognition	240,000
Stock Issued During Period, Value, Stock Options Exercised	2,804,000	2,802,000	2,000
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	1,715,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	$ (20,000)	(20,000)	0
Common Stock, Par or Stated Value Per Share	$ 0.01
Common Stock, Value, Issued	$ 237,000
Additional Paid in Capital, Common Stock	284,271,000
Retained Earnings (Accumulated Deficit)	270,218,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(90,908,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	463,818,000
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	(289,000)
Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, before Tax	$ 66,000
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	5,865
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	33,024
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 15,250,000
Stock Issued During Period, Value, Stock Dividend	(1,421,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	5,479,000
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	862,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	(193,000)
APIC, Share-based Payment Arrangement, Other, Increase for Cost Recognition	110,000
Stock Issued During Period, Value, Stock Options Exercised	676,000	676,000
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	(111,000)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	$ (104,000)	$ (104,000)	$ 0
Common Stock, Par or Stated Value Per Share	$ 0.01
Common Stock, Value, Issued	$ 237,000
Additional Paid in Capital, Common Stock	284,842,000
Retained Earnings (Accumulated Deficit)	284,047,000
Accumulated Other Comprehensive Income (Loss), Net of Tax	(84,760,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 484,366,000