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Derivative Instruments Interest Rate Swaps (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Not Designated as Hedging Instrument [Member]
Interest Rate Swap [Member]
Dec. 31, 2012
Not Designated as Hedging Instrument [Member]
Interest Rate Swap [Member]
Mar. 31, 2013
Derivative Counterparty, SunTrust [Member]
Not Designated as Hedging Instrument [Member]
Years
Dec. 31, 2013
Derivative Counterparty, SunTrust [Member]
Not Designated as Hedging Instrument [Member]
Mar. 31, 2013
Derivative Counterparty, SunTrust [Member]
Not Designated as Hedging Instrument [Member]
Interest Rate Swap [Member]
Dec. 31, 2012
Derivative Counterparty, SunTrust [Member]
Not Designated as Hedging Instrument [Member]
Interest Rate Swap [Member]
Derivative [Line Items]                
Derivative, Cap Interest Rate         2.50%      
Derivative, Notional Amount             $ 85,500,000  
Derivative, Fixed Interest Rate             2.415%  
Derivative Liability, Fair Value, Gross Liability     3,528,000 4,261,000     (3,528,000) (4,261,000)
Derivative Instruments, Interest Rate Swaps and Caps, Duration         7      
Derivative, Collateral, Obligation to Return Cash $ 649,800,000 $ 328,700,000       $ 500,000