Shareholders' Equity Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Before-tax amount [Abstract]
Foreign currency translation adjustment	$ (26,593)	$ (2,254)
Net unrealized gain (loss) on derivative instruments, designated as cash flow hedges	(10)	171
Net hedging (gain) loss reclassified to net income	(1,123)	(264)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax	538	342
Net defined benefit plan (gain) loss reclassified to net income	471	179
Total other comprehensive income (loss), before tax	(26,717)	(1,826)
Tax (provision) benefit [Abstract]
Foreign currency translation adjustment	1,148	(132)
Net unrealized gain (loss) on derivative instruments, designated as cash flow hedges	292	40
Net hedging (gain) loss reclassified to net income	74	188
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax	(4)	(15)
Net defined benefit plan (gain) loss reclassified to net income	(4)	(35)
Total other comprehensive income (loss) tax benefit	(1,506)	(46)
Net-of-tax amount [Abstract]
Foreign currency translation adjustment	(25,445)	(2,386)
Net unrealized gain (loss) on derivative instruments, designated as cash flow hedges	282	211
Net hedging (gain) loss reclassified to net income	(1,049)	(76)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	534	327
Net defined benefit plan (gain) loss reclassified to net income	467	144
Total other comprehensive income (loss), net of tax	(25,211)	(1,780)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(25,211)	(1,780)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(229,883)		$ (204,672)
OCI before reclassifications	(24,629)	(1,848)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI before reclassifications	(25,445)	(2,386)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI before reclassifications	282	211
Net Unrealized Gain (Loss) on Nonderivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(14,400)	(14,400)
OCI before reclassifications	0	0
Pension Benefit Obligation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI before reclassifications	$ 534	$ 327