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STOCKHOLDERS' EQUITY (AOCI) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accumulated Other Comprehensive Loss |  |  |  |
Total after-tax amount | $ 651,462 | $ 599,055 | $ 588,728 | $ 560,883
Impact on unrecognized net actuarial loss |  |  |  |
Change in the unrecognized net actuarial loss, after tax | (2,640) | (1,267) | (7,535) |
Accumulated Other Comprehensive Loss |  |  |  |
Accumulated Other Comprehensive Loss |  |  |  |
Total pre-tax amount | (27,181) | (31,840) | (38,507) |
Total after-tax amount | (20,574) | (23,417) | (27,496) | $ (23,479)
Unrecognized Net Periodic Benefit Costs |  |  |  |
Accumulated Other Comprehensive Loss |  |  |  |
Total pre-tax amount | (25,768) | (29,320) | (35,231) |
Total after-tax amount | (19,715) | (21,886) | (25,497) |
Interest Rate Swap |  |  |  |
Accumulated Other Comprehensive Loss |  |  |  |
Total pre-tax amount | 481 | (542) | (897) |
Total after-tax amount | 292 | (329) | (545) |
Foreign Currency Translation |  |  |  |
Accumulated Other Comprehensive Loss |  |  |  |
Total pre-tax amount | (1,894) | (1,978) | (2,379) |
Total after-tax amount | $ (1,151) | $ (1,202) | $ (1,454) |

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- Definition Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). + References No definition available. + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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