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STOCKHOLDERS' EQUITY (Details 2) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Impact on unrecognized net actuarial gain (loss) |  |  |
Change in the unrecognized net actuarial gain (loss), after tax | $ 18,683,000 | $ (5,830,000) | $ (27,178,000)
Nonunion Defined Benefit Pension Plan |  |  |
Impact on unrecognized net actuarial gain (loss) |  |  |
Change in the unrecognized net actuarial gain (loss), pre-tax | 66,300,000 |  |
Change in the unrecognized net actuarial gain (loss), after tax | 40,500,000 |  |
Curtailment gain, before tax | 29,300,000 |  |
Curtailment gain, net of tax | 17,900,000 |  |
Net actuarial gain related to change in discount rate, before tax | 27,800,000 |  |
Net actuarial gain related to change in discount rate, net of tax | $ 17,000,000 |  |

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