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COMMITMENTS AND CONTINGENCIES (Details 3) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Lease Commitments |  |  |
Rental expense | $ 22,800,000 | $ 23,200,000 | $ 15,000,000
Estimated future minimum rental payments under non-cancelable operating leases |  |  |
2012 | 22,149,000 |  |
2013 | 19,801,000 |  |
2014 | 17,693,000 |  |
2015 | 13,155,000 |  |
2016 | 10,051,000 |  |
Thereafter | 24,900,000 |  |
Total | $ 107,749,000 |  |

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