Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2012

Designated as Hedging Instrument [Member]

Derivatives, Fair Value [Line Items]

Interest rate derivatives designated and non designated

Maturity	Strike Rate			Notional Amount of Hedge		Cost of Hedge		Estimated Fair Value of Cap in Other Comprehensive Income			Unrealized Gain on Settled Cap in Other Comprehensive Income		Change in Cap Valuations Included in Other Comprehensive Income for the Nine Months Ended September 30, 2012
Oct 2014		1.00	%	$	21,000	$	174	$	(165	)	$	—	$	(77	)
Aug 2014		0.05	%		13,478		22		—			—		—

Not Designated as Hedging Instrument [Member]

Derivatives, Fair Value [Line Items]

Interest rate derivatives designated and non designated

Maturity	Strike Rate			Notional Amount of Hedge		Cost of Hedge		Estimated Fair Value		Change in Cap Valuations Included in Interest Expense for the Nine Months Ended September 30, 2012
May 2013		1.25	%	$	51,982	$	196	$	—	$	18
May 2014		1.75	%		51,982		434		1		46