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Financial Derivative Instruments (Tables)
 3 Months Ended
Mar. 31, 2015
Financial Derivative Instruments [Abstract]  
Schedule of Notional Amounts of Outstanding Derivative Positions
                 Unamortized      
      3-Month           Premium    Fair Value
  Notional Termination LIBOR Strike     Premium   at March   at March
  Amount Date Rate     Paid     31, 2015     31, 2015
 
$ 25,000 06/02/21 3.00% $ 922   $ 922   $ 464
$ 20,000 06/04/24 3.00% $ 1,470   $ 1,470   $ 839
$ 20,000 10/21/21 3.00% $ 632   $ 632   $ 428
$ 25,000 10/21/24 3.00% $ 1,542   $ 1,542 $ 1,126 
Schedule of Interest Rate Derivatives
    March 31, 2015  
    Gross     Net of Tax  
Unrealized loss on interest rate caps $ (1,709 ) $ (1,111 )
Unamortized premium on interest rate caps   4,566     2,968  
Total $ 2,857   $ 1,857  
 
 
    December 31, 2014  
    Gross     Net of Tax  
Unrealized losses on interest rate caps $ (1,111 ) $ ( 722 )
Unamortized premium on interest rate caps   4,566     2,968  
Total $ 3,455   $ 2,246