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COMMITMENTS AND CONTINGENCIES (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
COMMITMENTS AND CONTINGENCIES |  |  |
Rental expense under operating leases | $ 4,600,000 | $ 4,100,000 | $ 3,800,000
Future minimum rental payments under the operating leases |  |  |
2013 | 4,173,000 |  |
2014 | 3,610,000 |  |
2015 | 3,482,000 |  |
2016 | 2,874,000 |  |
2017 | 790,000 |  |
2018 and thereafter | 649,000 |  |
Total | $ 15,578,000 |  |

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