Shareholders' Equity Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Before-tax amount [Abstract]
Foreign currency translation adjustment	$ 20,520	$ (6,730)	$ 35,586	$ 3,728
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)	0	(1,407)	0	(1,407)
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	(634)	(2,128)	(537)	(6,641)
Net hedging loss reclassified into net income	259	280	637	566
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	418	(340)	824	(795)
Total other comprehensive income (loss), before tax	20,563	(10,325)	36,510	(4,549)
Tax (provision) benefit [Abstract]
Foreign currency translation adjustment	(73)	(243)	(123)	(595)
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	244	830	207	2,561
Net hedging loss reclassified into net income	(100)	(108)	(246)	(218)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax	(225)	49	(230)	186
Total other comprehensive income (loss) tax benefit	(154)	528	(392)	1,934
Net-of-tax amount [Abstract]
Foreign currency translation adjustment	20,447	(6,973)	35,463	3,133
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)	0	(1,407)	0	(1,407)
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	(390)	(1,298)	(330)	(4,080)
Net hedging loss (gain) reclassified into net income	159	172	391	348
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax	193	(291)	594	(609)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(193)	291	(594)	609
Total other comprehensive income (loss), net of tax	$ (20,409)	$ 9,797	(36,118)	2,615
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Net-of-tax amount [Abstract]
Total other comprehensive income (loss), net of tax			(35,463)	(1,726)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Net-of-tax amount [Abstract]
Total other comprehensive income (loss), net of tax			$ (61)	$ 3,732