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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Commitments under Non-cancelable Operating Leases
2012
$
9,551

2013
9,424

2014
9,529

2015
9,692

2016
10,188

Thereafter
641,230

 
$
689,614