Shareholders' Equity Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Before-tax amount [Abstract]
Foreign currency translation adjustment	$ 9,128	$ (15,528)	$ 12,856	$ (62,461)
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)	0	962	(1,407)	962
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	602	(296)	(6,039)	(1,104)
Net hedging loss reclassified into net income	279	412	845	1,235
Pension benefit obligation adjustment	(1,725)	877	(2,520)	1,887
Total other comprehensive income (loss), before tax	8,284	(13,573)	3,735	(59,481)
Tax (provision) benefit [Abstract]
Foreign currency translation adjustment	56	325	(539)	696
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	(231)	114	2,330	423
Net hedging loss reclassified into net income	(108)	(159)	(326)	(474)
Pension benefit obligation adjustment	527	(11)	713	(24)
Total other comprehensive income (loss) tax benefit	244	269	2,178	621
Net-of-tax amount [Abstract]
Foreign currency translation adjustment	9,184	(15,203)	12,317	(61,765)
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)	0	962	(1,407)	962
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	371	(182)	(3,709)	(681)
Net hedging loss (gain) reclassified into net income	171	253	519	761
Pension benefit obligation adjustment	(1,198)	866	(1,807)	1,863
Total other comprehensive income (loss), net of tax	$ (8,528)	$ 13,304	(5,913)	58,860
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Net-of-tax amount [Abstract]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			1,407	(962)
Total other comprehensive income (loss), net of tax			(10,910)	60,803
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Net-of-tax amount [Abstract]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(519)	(761)
Total other comprehensive income (loss), net of tax			$ 3,190	$ (80)