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BENEFIT PLANS, Amounts Recognized in AOCI, Net of Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Amounts recognized in AOCI, net of tax [Abstract] |  |  |
Total | $ 4,567 | $ 9,571 | $ (20,640)
Pension Benefits [Member] |  |  |
Amounts recognized in AOCI, net of tax [Abstract] |  |  |
Prior service cost | (5) | 932 |
Net (gain) loss | 4,482 | 8,492 |
Total | 4,477 | 9,424 |
Post-retirement Benefits [Member] |  |  |
Amounts recognized in AOCI, net of tax [Abstract] |  |  |
Prior service cost | 110 | 109 |
Net (gain) loss | (20) | 38 |
Total | $ 90 | $ 147 |

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- Definition Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans, attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569616-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569643-111683 + Details
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