Shareholders Equity Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ (105,053)	$ (348,556)	$ (241,326)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(125,005)	(383,854)	(284,706)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	248,510	(109,187)	(223,268)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	8,852	(2,439)	814
Other Comprehensive Income (Loss), Unrealized Gain on Derivatives Arising During Period, Net of Tax	(2,359)	373	871
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	8,853	10,148	2,947
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	258,849	(99,148)
Other comprehensive income	263,856	(101,105)	(218,636)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	243,503	(107,230)
Unrealized gain loss on investment securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	14,946	6,094	8,533
Unrealized gain loss on interest rate swaps designated as cash flow hedges, net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(5,306)	(2,947)	(3,320)
Employee benefit plan items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(29,592)	(38,445)	$ (48,593)
Other comprehensive income before reclassifications [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	253,259	(103,254)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	8,852	(2,439)
Other Comprehensive Income (Loss), Unrealized Gain on Derivatives Arising During Period, Net of Tax	(2,870)	0
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(3,812)	(737)
Other comprehensive income	255,429	(106,430)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(9,756)	(3,976)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	0	0
Other Comprehensive Income (Loss), Unrealized Gain on Derivatives Arising During Period, Net of Tax	511	373
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	12,665	10,885
Other comprehensive income	3,420	7,282
Intra-entity foreign currency transactions [Member] | Other comprehensive income before reclassifications [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	$ (64,610)	$ (12,852)