Derivative Instruments Interest Rate Swaps (Details) (USD $)	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Derivative [Line Items]
Derivative, Collateral, Obligation to Return Cash	$ 1,300,000
Derivative Instruments, Interest Rate Swaps, Duration	7
Derivative Counterparty, SunTrust [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount	79,000,000
Derivative Asset, Fair Value, Gross Asset	(3,252,000)	0
Derivative Counterparty, SunTrust [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Swaps, Maturity Date, October 15, 2011, 1.54% [Member]
Derivative [Line Items]
Notional Amount	85,500,000
Derivative, Description of Variable Rate Basis	*LIBOR
Derivative, Fixed Interest Rate	2.415%
Derivative Asset, Fair Value, Gross Asset	$ (4,319,000)	$ 0