Financial Instruments (Details 4) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Pre-tax net gains and losses on certain loans designated as hedges of net investments in foreign subsidiaries	$ 2,700,000	$ 22,600,000	$ (9,800,000)
Proceeds from cross-currency interest rate swap termination	75,057,000	0	$ 0
Foreign currency forward exchange contracts
Derivative [Line Items]
U.S. Dollar Equivalent	592,414,000	468,822,000
Recognized Gain (Loss)	4,090,000	(133,000)
Foreign currency forward exchange contracts | Short [Member] | British pounds sterling
Derivative [Line Items]
U.S. Dollar Equivalent	43,511,000	37,943,000
Recognized Gain (Loss)	822,000	179,000
Foreign currency forward exchange contracts | Short [Member] | Euros
Derivative [Line Items]
U.S. Dollar Equivalent	336,397,000	193,370,000
Recognized Gain (Loss)	547,000	2,993,000
Foreign currency forward exchange contracts | Short [Member] | No currency
Derivative [Line Items]
U.S. Dollar Equivalent	35,426,000	12,641,000
Recognized Gain (Loss)	316,000	439,000
Foreign currency forward exchange contracts | Long [Member] | British pounds sterling
Derivative [Line Items]
U.S. Dollar Equivalent	2,062,000	2,783,000
Recognized Gain (Loss)	(54,000)	(4,000)
Foreign currency forward exchange contracts | Long [Member] | Euros
Derivative [Line Items]
U.S. Dollar Equivalent	167,037,000	194,084,000
Recognized Gain (Loss)	2,497,000	(3,767,000)
Foreign currency forward exchange contracts | Long [Member] | No currency
Derivative [Line Items]
U.S. Dollar Equivalent	7,981,000	28,001,000
Recognized Gain (Loss)	(38,000)	$ 27,000
Maturing 2020 | Derivatives Designated as Hedging Instruments
Derivative [Line Items]
U.S. Dollar Equivalent	220,000,000.0
Maturing 2013 through 2017 | Derivatives Designated as Hedging Instruments
Derivative [Line Items]
U.S. Dollar Equivalent	$ 6,500,000.0