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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - AOCI reclassifications (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
AOIC reclassifications |  |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | $ (328) | $ 1,300 | $ 200
Pension and other postretirement benefit plans |  |  |
AOIC reclassifications |  |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | 716 | $ 1,300 | $ 200
Investment |  |  |
AOIC reclassifications |  |  |
Amounts reclassified from accumulated other comprehensive income, net of tax | $ (1,044) |  |

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- Definition Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 + Details
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