Derivatives and Hedging Activity (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Fair value of derivative instruments
Derivative in an Asset Position, Fair Value	$ 12,816	$ 337
Derivative in a Liability Position, Fair Value	19,652	9,400
Derivatives designated as cash flow hedging instruments
Fair value of derivative instruments
Derivative in an Asset Position, Fair Value		89
Derivative in a Liability Position, Fair Value	1,420	1,714
Derivatives not designated as hedging instruments
Fair value of derivative instruments
Derivative in an Asset Position, Fair Value	12,816	248
Derivative in a Liability Position, Fair Value	18,232	7,686
Interest rate contracts | Derivatives designated as cash flow hedging instruments
Fair value of derivative instruments
Derivative in an Asset Position, Fair Value		89
Derivative in a Liability Position, Fair Value	1,420	1,714
Interest rate contracts | Derivatives not designated as hedging instruments
Fair value of derivative instruments
Derivative in an Asset Position, Fair Value	7,555	248
Derivative in a Liability Position, Fair Value	11,342	303
Foreign exchange contracts | Derivatives not designated as hedging instruments
Fair value of derivative instruments
Derivative in an Asset Position, Fair Value	5,261
Derivative in a Liability Position, Fair Value	$ 6,890	$ 7,383