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Derivative Financial Instruments (Details 3) (Derivatives in Cash Flow Hedging Relationship, USD $)
6 Months Ended
Jun. 30, 2013
Interest rate cap
Credit facility
Jun. 30, 2013
Zero premium interest rate collar
Credit facility
Jun. 30, 2013
Interest rate swap
Revolving credit facility
Jun. 30, 2013
Derivatives Designated as Hedging Instruments
Dec. 31, 2012
Derivatives Designated as Hedging Instruments
Jun. 30, 2013
Derivatives Designated as Hedging Instruments
Interest rate cap
Dec. 31, 2012
Derivatives Designated as Hedging Instruments
Interest rate cap
Jun. 30, 2013
Derivatives Designated as Hedging Instruments
Zero premium interest rate collar
Dec. 31, 2012
Derivatives Designated as Hedging Instruments
Zero premium interest rate collar
Jun. 30, 2013
Derivatives Designated as Hedging Instruments
Interest rate swap
Dec. 31, 2012
Derivatives Designated as Hedging Instruments
Interest rate swap
Fair values of derivative financial instruments                      
Hedged borrowings $ 100,000,000 $ 100,000,000 $ 100,000,000                
Borrowings variable interest rate one-month LIBOR one-month LIBOR one-month LIBOR                
Fixed rate (as a percent)     3.93%                
Maximum cap rate (as a percent) 5.50%                    
Asset Derivatives           92,000 35,000        
Liability Derivatives       $ 9,937,000 $ 13,402,000     $ 642,000 $ 1,868,000 $ 9,295,000 $ 11,534,000