Derivative Financial Instruments (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Expected increase to interest expense	$ 3,400,000		$ 3,400,000
Derivatives designated as cash flow hedges in prepaid expenses and other assets l [Abstract]
Interest rate swaps	0		0		301,000
Derivatives designated as cash flow hedges in accounts payable, accrued expenses and other liabilities [Abstract]
Interest rate swaps	2,744,000		2,744,000		510,000
Amount of unrealized gains/(losses) recognized in AOCL on derivatives (effective portion) [Abstract]
Interest rate swaps	(2,846,000)	6,319,000	(4,250,000)	6,599,000
Amount of losses reclassified out of AOCL into contractual interest expense (effective portion) [Abstract]
Interest rate swaps	$ 944,000	$ 800,000	$ 1,872,000	$ 1,588,000