Fair Value of Financial Instruments (Schedule of Pre-tax Loss Recognized as a Component of Other Comprehensive Income) (Details) (Cash Flow Hedging [Member], Interest Rate Swap [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Pre-Tax (Loss) Gain Recognized in OCI on Derivatives (Effective Portion)	$ (20,689)	$ (49,499)	$ (65,515)	$ (113,071)