Derivative Financial Instruments And Hedging Activities Derivatives Income (Losses) Recognized in Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	$ 53	$ 2,877	$ 337	$ 3,037
Gain on Cash Flow Hedge Ineffectiveness	(69)		(161)	300
Derivative Instruments, Gain (Loss) Recognized in Income, Net		23		260
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(11)	(1,078)	(66)	(1,930)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(50)	(893)	2,415	(1,892)
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	53	879	337	912
Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments		$ 1,998		$ 2,125