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ACCUMULATED OTHER COMPREHENSIVE INCOME - Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net realized investment gains (losses) and, beginning in 2018, change in unrealized investment gains on equity investments $ 11,135 $ (594) $ (118) $ 2,166
Total income tax expense (benefit) (5,296) 1,186 (2,117) (2,175)
Net income 19,148 746 14,077 13,054
Net reclassification adjustment (219) 535 (3,671) 5,215
Unrealized gains (losses) on investments: | Reclassification Out Of Accumulated Other Comprehensive Income [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net realized investment gains (losses) and, beginning in 2018, change in unrealized investment gains on equity investments (960) 405 (6,694) 6,767
Total income tax expense (benefit) 202 (141) 1,406 (2,368)
Net income (758) 264 (5,288) 4,399
Unrecognized pension and postretirement benefit obligations, net actuarial loss        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassification adjustment for amounts amortized into net periodic pension and postretirement benefit income: [1] (106) (370) (316) (1,107)
Net reclassification adjustment     (250) (719)
Unrecognized pension and postretirement benefit obligations, prior service credit        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassification adjustment for amounts amortized into net periodic pension and postretirement benefit income: [1] 788 787 2,363 2,362
Net reclassification adjustment     1,867 1,535
Total        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassification adjustment for amounts amortized into net periodic pension and postretirement benefit income: 682 417 2,047 1,255
Deferred income tax (expense) benefit (143) (146) (430) (439)
Net reclassification adjustment $ 539 $ 271 $ 1,617 $ 816
[1] These reclassified components of accumulated other comprehensive income are included in the computation of net periodic pension and postretirement benefit income (see note 7, Employee Retirement Plans, for additional details).