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Derivative Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 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  Year
Ended December 31,		  

Aug 2014

     0.5 %    $ 13,408     $ 22     $ (4 )    $ —       $ (4 ) 
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 Year Ended
December 31, 2012		  

Oct 2014

     1.00 %    $ 5,753     $ 174     $ 1     $ 121  

May 2013

     1.25 %      51,982       196       —         19  

May 2014

     1.75 %      51,982       434       —         49