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STOCKHOLDERS' EQUITY (Details 2) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Impact on unrecognized net actuarial gain (loss) |  |  |
Change in the unrecognized net actuarial gain (loss), after tax | $ (5,830,000) | $ (27,178,000) | $ 3,064,000
Nonunion Defined Benefit Pension Plan |  |  |
Impact on unrecognized net actuarial gain (loss) |  |  |
Change in the unrecognized net actuarial gain (loss), pre-tax |  | (34,400,000) |
Change in the unrecognized net actuarial gain (loss), after tax |  | $ (25,000,000) |

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