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Derivative Instruments (Tables)
6 Months Ended
Jun. 30, 2012
Derivative Instruments [Abstract]  
Set Forth Terms Of Interest Rate Swap Derivative Instruments
    Notional Pay Fixed   Receive    
Type of Instrument   Amount Rate   Variable Rate   Maturity Date
Interest rate swap $ 31,406,000 1.340 % 0.461 % December 31, 2013
Interest rate swap $ 84,959,000 5.500 % 3.625 % June 30, 2016