Derivative Financial Instruments And Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Fair Value Hedge Assets		$ 133
Fair Value Hedge Liabilities		133
Interest Rate Cap [Member]
Derivatives, Fair Value [Line Items]
Fair Value Hedge Assets	784	386
Fair Value Hedge Liabilities	795	394
Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Fair Value Hedge Assets	2,221
Fair Value Hedge Liabilities	2,257
Derivative Financial Instruments, Assets [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Interest Rate Derivatives	3,154,098	775,109
Fair Value Hedge Assets	3,005	519
Derivative Financial Instruments, Liabilities [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Interest Rate Derivatives	3,154,098	775,109
Fair Value Hedge Liabilities	3,052	527
Other Assets [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Interest Rate Derivatives		24,126
Other Assets [Member] | Interest Rate Cap [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Interest Rate Derivatives	1,654,098	750,983
Other Assets [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Interest Rate Derivatives	1,500,000
Interest Rate Swap And Cap Agreements [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Interest Rate Derivatives		24,126
Interest Rate Swap And Cap Agreements [Member] | Interest Rate Cap [Member]
Derivatives, Fair Value [Line Items]
Notional Amount of Interest Rate Derivatives	$ 1,654,098	$ 750,983