Derivative Instruments, Hedging Activities and Fair Value (Details 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Foreign Currency Derivatives
Pre-tax net gains (losses) on certain loans designated as hedges of net investments in foreign subsidiaries	$ (3,900)	$ 3,100
Foreign currency forward exchange contracts
Foreign Currency Derivatives
U.S. Dollar Equivalent	585,948		$ 592,414
Recognized Gain (Loss)	(9,533)	4,090
Foreign currency forward exchange contracts | British pounds sterling | Sell
Foreign Currency Derivatives
U.S. Dollar Equivalent	53,161		43,511
Recognized Gain (Loss)	(516)	822
Foreign currency forward exchange contracts | British pounds sterling | Buy
Foreign Currency Derivatives
U.S. Dollar Equivalent	2,304		2,062
Recognized Gain (Loss)	6	(54)
Foreign currency forward exchange contracts | Euros | Sell
Foreign Currency Derivatives
U.S. Dollar Equivalent	322,354		336,397
Recognized Gain (Loss)	(8,613)	547
Foreign currency forward exchange contracts | Euros | Buy
Foreign Currency Derivatives
U.S. Dollar Equivalent	148,788		167,037
Recognized Gain (Loss)	789	2,497
Foreign currency forward exchange contracts | Other currencies | Sell
Foreign Currency Derivatives
U.S. Dollar Equivalent	43,736		35,426
Recognized Gain (Loss)	(1,206)	316
Foreign currency forward exchange contracts | Other currencies | Buy
Foreign Currency Derivatives
U.S. Dollar Equivalent	15,605		$ 7,981
Recognized Gain (Loss)	$ 7	$ (38)