Shareholders' Equity Other Comprehensive Income (Loss) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Before-tax amount [Abstract]
Foreign currency translation adjustment	$ (16,501,000)	$ (576,000)	$ (13,403,000)	$ (18,554,000)
Foreign currency translation adjustment reclassified into net income on disposal	2,443,000	0	2,443,000	0
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	4,088,000	712,000	4,910,000	5,216,000
Net hedging (gain) loss reclassified into net income	(3,453,000)	175,000	(6,327,000)	(2,198,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax	598,000	0	1,318,000	0
Net defined benefit plan (gain) loss reclassified to net income	(90,000)	399,000	(100,000)	1,228,000
Total other comprehensive income (loss), before tax	(12,915,000)	710,000	(11,159,000)	(14,308,000)
Tax (provision) benefit [Abstract]
Foreign currency translation adjustment	156,000	(102,000)	(141,000)	16,000
Disposal Group, including discontinued operations, Foreign Currency Translation Gains (Losses), tax (provision) benefit	0	0	0	0
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	(91,000)	(20,000)	85,000	(446,000)
Net hedging (gain) loss reclassified into net income	151,000	41,000	528,000	(9,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax	(10,000)	0	(67,000)	0
Net defined benefit plan (gain) loss reclassified to net income	4,000	(7,000)	5,000	(21,000)
Total other comprehensive income (loss) tax benefit	(210,000)	88,000	(410,000)	460,000
Net-of-tax amount [Abstract]
Foreign currency translation adjustment	(16,345,000)	(678,000)	(13,544,000)	(18,538,000)
Foreign currency translation adjustment reclassified into net income on disposal	2,443,000	0	2,443,000	0
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	3,997,000	692,000	4,995,000	4,770,000
Net hedging (gain) loss reclassified into net income	(3,302,000)	216,000	(5,799,000)	(2,207,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	588,000	0	1,251,000	0
Net defined benefit plan (gain) loss reclassified to net income	(86,000)	392,000	(95,000)	1,207,000
Total other comprehensive income (loss), net of tax	$ (12,705,000)	$ 622,000	$ (10,749,000)	$ (14,768,000)