Shareholders' Equity Other Comprehensive Income (Loss) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Before-tax amount [Abstract]
Foreign currency translation adjustment	$ 15,521,000	$ (16,501,000)	$ (387,000)	$ (13,403,000)
Net unrealized gain (loss) on derivative instruments, designated as cash flow hedges	(2,887,000)	4,088,000	(5,228,000)	4,910,000
Net hedging (gain) loss reclassified to net income	2,879,000	(3,453,000)	2,588,000	(6,327,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax	(893,000)	598,000	(812,000)	1,318,000
Net defined benefit plan (gain) loss reclassified to net income	499,000	(90,000)	1,439,000	(100,000)
Total other comprehensive income (loss), before tax	15,105,000	(12,915,000)	49,674,000	(11,159,000)
Tax (provision) benefit [Abstract]
Foreign currency translation adjustment	(1,533,000)	156,000	240,000	(141,000)
Net unrealized gain (loss) on derivative instruments, designated as cash flow hedges	74,000	(91,000)	501,000	85,000
Net hedging (gain) loss reclassified to net income	(67,000)	151,000	(18,000)	528,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax	(341,000)	(10,000)	(339,000)	(67,000)
Net defined benefit plan (gain) loss reclassified to net income	576,000	4,000	601,000	5,000
Total other comprehensive income (loss) tax benefit	(1,291,000)	210,000	985,000	410,000
Net-of-tax amount [Abstract]
Foreign currency translation adjustment	13,988,000	(16,345,000)	(147,000)	(13,544,000)
Net unrealized gain (loss) on derivative instruments, designated as cash flow hedges	(2,813,000)	3,997,000	(4,727,000)	4,995,000
Net hedging (gain) loss reclassified to net income	2,812,000	(3,302,000)	2,570,000	(5,799,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	(1,234,000)	588,000	(1,151,000)	1,251,000
Net defined benefit plan (gain) loss reclassified to net income	1,075,000	(86,000)	2,040,000	(95,000)
Total other comprehensive income (loss), net of tax	13,814,000	(12,705,000)	50,659,000	(10,749,000)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	13,814,000	(12,705,000)	50,659,000	(10,749,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(154,013,000)		(154,013,000)		$ (204,672,000)
OCI before reclassifications			(6,025,000)	(7,298,000)
Foreign currency translation adjustment reclassified to net income on sale of business	(14,000)	2,443,000	52,074,000	2,443,000
Foreign currency translation adjustment reclassified to net income on sale of business	0	0	0	0
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI before reclassifications			(147,000)	(13,544,000)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI before reclassifications			(4,727,000)	4,995,000
Net Unrealized Gain (Loss) on Nonderivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (14,400,000)	$ (14,400,000)	(14,400,000)	(14,400,000)
OCI before reclassifications			0	0
Pension Benefit Obligation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI before reclassifications			$ (1,151,000)	$ 1,251,000