Derivative Instruments, Hedging Activities and Fair Value (Details 3) (USD $)	3 Months Ended			12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	1 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Foreign currency forward exchange contracts	Dec. 31, 2013 Foreign currency forward exchange contracts	Mar. 31, 2014 Foreign currency forward exchange contracts British pounds sterling Sell	Dec. 31, 2013 Foreign currency forward exchange contracts British pounds sterling Sell	Mar. 31, 2014 Foreign currency forward exchange contracts British pounds sterling Buy	Dec. 31, 2013 Foreign currency forward exchange contracts British pounds sterling Buy	Mar. 31, 2014 Foreign currency forward exchange contracts Euros Sell	Dec. 31, 2013 Foreign currency forward exchange contracts Euros Sell	Mar. 31, 2014 Foreign currency forward exchange contracts Euros Buy	Dec. 31, 2013 Foreign currency forward exchange contracts Euros Buy	Mar. 31, 2014 Foreign currency forward exchange contracts Other currencies Sell	Dec. 31, 2013 Foreign currency forward exchange contracts Other currencies Sell	Mar. 31, 2014 Foreign currency forward exchange contracts Other currencies Buy	Dec. 31, 2013 Foreign currency forward exchange contracts Other currencies Buy	Dec. 31, 2013 Affiliated Entity [Member] Foreign currency forward exchange contracts	Mar. 31, 2014 Affiliated Entity [Member] Foreign currency forward exchange contracts
Foreign Currency Derivatives
U.S. Dollar Equivalent			$ 561,190,000	$ 541,850,000	$ 27,256,000	$ 26,931,000	$ 10,144,000	$ 1,976,000	$ 252,913,000	$ 248,943,000	$ 243,761,000	$ 242,385,000	$ 16,289,000	$ 12,708,000	$ 10,827,000	$ 8,907,000	$ 121,200,000	$ 125,000,000
Recognized Gain (Loss)			966,000	(2,028,000)	(76,000)	(277,000)	45,000	15,000	3,258,000	(335,000)	(2,455,000)	(1,335,000)	52,000	(134,000)	142,000	38,000	700,000	100,000
Pre-tax net gains (losses) on certain loans designated as hedges of net investments in foreign subsidiaries	$ 200,000	$ 1,700,000