Derivatives (Details) (USD $)	3 Months Ended			3 Months Ended				3 Months Ended				3 Months Ended				3 Months Ended				3 Months Ended				3 Months Ended				3 Months Ended				3 Months Ended				3 Months Ended				3 Months Ended				3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Assets [Member]	Mar. 31, 2014 .76% Derivative [Member]		Dec. 31, 2013 .76% Derivative [Member]		Mar. 31, 2014 Derivative @ 2.196% 28.1K [Member]		Dec. 31, 2013 Derivative @ 2.196% 28.1K [Member]		Mar. 31, 2014 Derivative B @ 2.479% 50K [Member] [Member]		Dec. 31, 2013 Derivative B @ 2.479% 50K [Member] [Member]		Mar. 31, 2014 Derivative @ 2.873% 35K [Member]		Dec. 31, 2013 Derivative @ 2.873% 35K [Member]		Mar. 31, 2014 Derivative @ 2.864% 60K [Member]		Dec. 31, 2013 Derivative @ 2.864% 60K [Member]		Mar. 31, 2014 Derivative @ 2.087% 75K [Member]		Dec. 31, 2013 Derivative @ 2.087% 75K [Member]		Mar. 31, 2014 Derivative @ 2.088% 50K [Member]		Dec. 31, 2013 Derivative @ 2.088% 50K [Member]		Mar. 31, 2014 Derivative @ 2.479% 75K [Member]		Dec. 31, 2013 Derivative @ 2.479% 75K [Member]		Mar. 31, 2014 Derivative A @ 2.479% 50K [Member]		Dec. 31, 2013 Derivative A @ 2.479% 50K [Member]		Mar. 31, 2014 Derivative @ 3.41% 45K [Member] [Member]		Dec. 31, 2013 Derivative @ 3.41% 45K [Member] [Member]		Mar. 31, 2014 Swap [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 2 [Member] Fair Value, Measurements, Recurring [Member]		Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Fair Value, Measurements, Recurring [Member]		Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Fair Value, Measurements, Recurring [Member] .76% Derivative [Member]
Derivative [Line Items]
Derivative, Inception Date				Oct. 01, 2011				Oct. 16, 2013				Aug. 01, 2015				Apr. 15, 2014				Apr. 15, 2014				Apr. 15, 2014				Apr. 15, 2014				Aug. 01, 2015				Aug. 01, 2015				Aug. 01, 2015
Derivative, Maturity Date				Sep. 01, 2014				Oct. 16, 2020				Aug. 01, 2025				Apr. 15, 2024				Apr. 15, 2024				Apr. 15, 2024				Apr. 15, 2024				Aug. 01, 2025				Aug. 01, 2025				Aug. 01, 2025
Derivative, Early Termination Date												Feb. 01, 2016	[1]			Oct. 15, 2014	[1]			Oct. 15, 2014	[1]			Oct. 15, 2014	[1]			Oct. 15, 2014	[1]			Feb. 01, 2016	[1]			Feb. 01, 2016	[1]			Feb. 01, 2016	[1]
Derivative, Notional Amount			$ 440,000,000	$ 9,000,000				$ 28,100,000				$ 50,000,000				$ 35,000,000				$ 60,000,000				$ 75,000,000				$ 50,000,000				$ 75,000,000				$ 50,000,000				$ 45,000,000
Derivative, Description of Variable Rate Basis				1 Month LIBOR				1 Month LIBOR				3 Month LIBOR				3 Month LIBOR				3 Month LIBOR				3 Month LIBOR				3 Month LIBOR				3 Month LIBOR				3 Month LIBOR				3 Month LIBOR
Derivative, Fixed Interest Rate				0.76%				2.196%				2.479%				2.8725%				2.864%				2.087%				2.088%				2.479%				2.479%				3.411%
Derivative, Fixed Interest Rate			2.55%
Derivative Asset, Fair Value, Gross Asset				0	[2]	0	[2]	0	[2]	(82,000)	[2]	(3,898,000)	[2]	(5,658,000)	[2]	0	[2]	(1,036,000)	[2]	0	[2]	(1,821,000)	[2]	(5,094,000)	[2]	(7,476,000)	[2]	(3,391,000)	[2]	(4,978,000)	[2]	(5,862,000)	[2]	(8,516,000)	[2]	(3,906,000)	[2]	(5,670,000)	[2]	0	[2]	0	[2]		(22,151,000)	[2]	(35,237,000)	[2]
Derivative Liability, Fair Value, Gross Liability				(23,000)	[2]			(199,000)	[2]	0	[2]	0	[2]	0	[2]	(107,000)	[2]	0	[2]	(137,000)	[2]	0	[2]	0	[2]	0	[2]	0	[2]	0	[2]	0	[2]	0	[2]	0	[2]	0	[2]	(127,000)	[2]	0	[2]		593,000	[2]	34,000	[2]	34,000	[2]
Effective portion of change in fair value of derivative instruments	(13,800,000)	3,372,000
Amount reclassified from accumulated other comprehensive loss	(2,474,000)	(2,366,000)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	0	0
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 14,000,000																																											$ 8,900,000

[1] Represents the date specified in the agreement for either optional or mandatory early termination which will result in cash settlement.

[2] Derivatives in an asset position are included within Other Assets in the accompanying Consolidated Balance Sheets, while those in a liability position are included within Accounts Payable and Other Liabilities.