Derivative Instruments, Hedging Activities and Fair Value (Details 3) (USD $)	3 Months Ended		9 Months Ended			12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Foreign currency forward exchange contracts	Dec. 31, 2012 Foreign currency forward exchange contracts	Sep. 30, 2013 Foreign currency forward exchange contracts British pounds sterling Sell	Dec. 31, 2012 Foreign currency forward exchange contracts British pounds sterling Sell	Sep. 30, 2013 Foreign currency forward exchange contracts British pounds sterling Buy	Dec. 31, 2012 Foreign currency forward exchange contracts British pounds sterling Buy	Sep. 30, 2013 Foreign currency forward exchange contracts Euros Sell	Dec. 31, 2012 Foreign currency forward exchange contracts Euros Sell	Sep. 30, 2013 Foreign currency forward exchange contracts Euros Buy	Dec. 31, 2012 Foreign currency forward exchange contracts Euros Buy	Sep. 30, 2013 Foreign currency forward exchange contracts Other currencies Sell	Dec. 31, 2012 Foreign currency forward exchange contracts Other currencies Sell	Sep. 30, 2013 Foreign currency forward exchange contracts Other currencies Buy	Dec. 31, 2012 Foreign currency forward exchange contracts Other currencies Buy
Foreign Currency Derivatives
U.S. Dollar Equivalent					$ 362,669,000	$ 434,095,000	$ 25,998,000	$ 0	$ 8,035,000	$ 6,141,000	$ 184,091,000	$ 264,234,000	$ 128,023,000	$ 116,618,000	$ 5,590,000	$ 2,811,000	$ 10,932,000	$ 44,291,000
Recognized Gain (Loss)					(2,230,000)	(923,000)	(534,000)	0	50,000	58,000	(1,870,000)	(1,082,000)	170,000	187,000	(16,000)	(15,000)	(30,000)	(71,000)
Pre-tax net gains (losses) on certain loans designated as hedges of net investments in foreign subsidiaries	$ 4,900,000	$ 1,900,000	$ 8,300,000	$ 4,400,000