Derivatives and Hedging Activities (Details) (USD $)	3 Months Ended	1 Months Ended				3 Months Ended
	Mar. 31, 2014	Jan. 31, 2012 Interest Rate Swap [Member]	Mar. 31, 2014 Designated as Hedging Instrument [Member] Interest Rate Swap [Member] Accounts Payable And Other Liabilities [Member]	Dec. 31, 2013 Designated as Hedging Instrument [Member] Interest Rate Swap [Member] Accounts Payable And Other Liabilities [Member]	Mar. 31, 2014 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] Financial_Instrument	Mar. 31, 2014 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] Interest Expense [Member]	Mar. 31, 2013 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] Interest Expense [Member]
Derivative [Line Items]
Derivative Instrument, Settlement Amount		$ 3,539,000
Derivative, Notional Amount					505,000,000
Expected Amount Of Derivative Related Interest To Be Reclassified To Interest Expense Over The Next 12 Months	5,485,000
Derivative, Number of Instruments Held					10
Derivative Asset			3,927,000	4,439,000
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion)						(1,784,000)	262,000
Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion)		$ 1,837,000				$ 1,272,000	$ 440,000