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STOCKHOLDERS' EQUITY (AOCI) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Accumulated Other Comprehensive Loss |  |  |  |
Total after-tax amount | $ 588,728 | $ 560,883 | $ 520,461 | $ 458,999
Impact on unrecognized net actuarial gain (loss) |  |  |  |
Change in the unrecognized net actuarial gain (loss), after tax | (7,535) | (13,567) | 18,683 |
Accumulated Other Comprehensive Loss |  |  |  |
Accumulated Other Comprehensive Loss |  |  |  |
Total pre-tax amount | (38,507) | (31,932) | (17,907) |
Total after-tax amount | (27,496) | (23,479) | (14,912) | $ (57,372)
Unrecognized Net Periodic Benefit Costs |  |  |  |
Accumulated Other Comprehensive Loss |  |  |  |
Total pre-tax amount | (35,231) | (30,140) | (17,044) |
Total after-tax amount | (25,497) | (22,387) | (14,386) |
Interest Rate Swap |  |  |  |
Accumulated Other Comprehensive Loss |  |  |  |
Total pre-tax amount | (897) | (576) |  |
Total after-tax amount | (545) | (350) |  |
Foreign Currency Translation |  |  |  |
Accumulated Other Comprehensive Loss |  |  |  |
Total pre-tax amount | (2,379) | (1,216) | (863) |
Total after-tax amount | (1,454) | (742) | $ (526) |
Nonunion Defined Benefit Pension Plan |  |  |  |
Impact on unrecognized net actuarial gain (loss) |  |  |  |
Change in the unrecognized net actuarial gain (loss), pre-tax | (4,200) | (8,300) |  |
Change in the unrecognized net actuarial gain (loss), after tax | $ (2,500) | (5,100) |  |
Postretirement Health Benefit Plan |  |  |  |
Impact on unrecognized net actuarial gain (loss) |  |  |  |
Change in the unrecognized net actuarial gain (loss), pre-tax |  | (5,200) |  |
Change in the unrecognized net actuarial gain (loss), after tax |  | $ (3,200) |  |

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