Derivatives and Hedging Activities (Effect of Derivative Instruments on Consolidated Statement of Operations) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Derivative
Accumulated other comprehensive income (losses)	$ 108,000	$ (26,054,000)	$ (35,848,000)	$ (48,847,000)
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)	10,684,000	(8,411,000)	(14,012,000)
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(16,370,000)	(20,113,000)	(27,639,000)
Interest Expense
Derivative
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net	(37,000)	39,000	195,000
Interest Rate Contract
Derivative
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)	10,684,000	(8,411,000)	(14,012,000)
Interest Rate Contract | Interest Expense
Derivative
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(16,370,000)	(20,113,000)	(27,639,000)
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	37,000	(39,000)	(195,000)
Not Designated as Hedging Instrument
Derivative
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(16,000)	(66,000)	(24,000)
Not Designated as Hedging Instrument | Interest Expense
Derivative
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(16,000)	(66,000)	(24,000)
Parent Company [Member]
Derivative
Accumulated other comprehensive income (losses)	$ 108,000	$ (26,054,000)