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COMMITMENTS AND CONTINGENCIES (Tables)
12 Months Ended
Dec. 31, 2011
COMMITMENTS AND CONTINGENCIES  
Minimum future rental payments under non-cancelable operating leases
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  Total   2012   2013   2014   2015   2016   Thereafter  
 

Lease obligations

  $ 70,747   $ 15,847   $ 12,430   $ 7,971   $ 3,559   $ 2,874   $ 28,066