Derivative Instruments, Hedging Activities and Fair Value (Details 3) (USD $)	3 Months Ended		6 Months Ended			12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	1 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Foreign currency forward exchange contracts	Dec. 31, 2013 Foreign currency forward exchange contracts	Jun. 30, 2014 Foreign currency forward exchange contracts British pounds sterling Sell	Dec. 31, 2013 Foreign currency forward exchange contracts British pounds sterling Sell	Jun. 30, 2014 Foreign currency forward exchange contracts British pounds sterling Buy	Dec. 31, 2013 Foreign currency forward exchange contracts British pounds sterling Buy	Jun. 30, 2014 Foreign currency forward exchange contracts Euros Sell	Dec. 31, 2013 Foreign currency forward exchange contracts Euros Sell	Jun. 30, 2014 Foreign currency forward exchange contracts Euros Buy	Dec. 31, 2013 Foreign currency forward exchange contracts Euros Buy	Jun. 30, 2014 Foreign currency forward exchange contracts Other currencies Sell	Dec. 31, 2013 Foreign currency forward exchange contracts Other currencies Sell	Jun. 30, 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	Jun. 30, 2014 Affiliated Entity [Member] Foreign currency forward exchange contracts
Foreign Currency Derivatives
U.S. Dollar Equivalent					$ 600,257,000	$ 541,850,000	$ 24,902,000	$ 26,931,000	$ 7,165,000	$ 1,976,000	$ 263,296,000	$ 248,943,000	$ 259,010,000	$ 242,385,000	$ 35,751,000	$ 12,708,000	$ 10,133,000	$ 8,907,000	$ 121,200,000	$ 132,200,000
Recognized Gain (Loss)					845,000	(2,028,000)	(57,000)	(277,000)	15,000	15,000	818,000	(335,000)	12,000	(1,335,000)	(16,000)	(134,000)	73,000	38,000	700,000	600,000
Pre-tax net gains (losses) on certain loans designated as hedges of net investments in foreign subsidiaries	$ 4,600,000	$ (4,900,000)	$ 4,900,000	$ (3,200,000)