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Summary of Significant Accounting Policies - Derivative Instruments (Details) (USD $)
Jan. 11, 2012
Dec. 31, 2013
Interest Rate Cap [Member]
instrument
Dec. 31, 2013
Interest Rate Swap [Member]
instrument
Dec. 31, 2013
Designated as Hedging Instrument [Member]
Dec. 31, 2012
Designated as Hedging Instrument [Member]
Dec. 31, 2013
Designated as Hedging Instrument [Member]
Interest rate contracts [Member]
Interest rate products [Member]
Dec. 31, 2012
Designated as Hedging Instrument [Member]
Interest rate contracts [Member]
Interest rate products [Member]
Derivative [Line Items]              
Number of Instruments   2 1        
Derivative, Notional Amount $ 42,000,000 $ 97,000,000 $ 64,500,000        
Asset Derivatives       192,000 71,000 192,000 71,000
Liability Derivative       $ 0 $ 0 $ 0 $ 0