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Derivative Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2013
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 Cap in Other
Comprehensive
Income		     Change in Cap
Valuations Included in
Other Comprehensive
Income for the Three
Months Ended
March 31, 2013		  

Aug 2014

     0.50 %    $ 13,337     $ 22     $ (1 )    $  —       $  —    
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 Three Months
Ended March 31,
2013		  

May 2013

     1.25 %    $ 51,982     $ 196     $  —       $  —    

Aug 2014

     1.75 %      51,982       434       —         —    

Oct 2014

     1.00 %      5,754       174       1       —