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		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
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)	$ 6,276	$ (21,704)	$ 3,654	$ (44,826)