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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Jan. 01, 2018
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]          
Change in accumulated other comprehensive income before reclassifications $ 38,869 $ (20,123) $ 28,589    
Reclassification adjustments from accumulated other comprehensive income 4,755 5,867 (638)    
Cumulative effect of change in accounting principle       $ (514) $ 0
Net unrealized appreciation on investments          
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]          
Beginning balance (9,323) 214,865 133,892    
Change in accumulated other comprehensive income before reclassifications 55,399 (33,564) 48,467    
Reclassification adjustments from accumulated other comprehensive income 1,203 620 (4,152)    
Accumulated effect of change in enacted tax rate     36,658    
Cumulative effect of change in accounting principle         (191,244)
Ending balance 47,279 (9,323) 214,865    
Liability for underfunded employee benefit costs          
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]          
Beginning balance (21,149) (46,551) (24,837)    
Change in accumulated other comprehensive income before reclassifications (16,530) 20,155 (19,878)    
Reclassification adjustments from accumulated other comprehensive income 3,552 5,247 3,514    
Accumulated effect of change in enacted tax rate     (5,350)    
Ending balance (34,127) (21,149) (46,551)    
Accumulated other comprehensive income, net of tax          
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]          
Beginning balance (30,472) 168,314 109,055    
Change in accumulated other comprehensive income before reclassifications 38,869 (13,409) 28,589    
Reclassification adjustments from accumulated other comprehensive income 4,755 5,867 (638)    
Accumulated effect of change in enacted tax rate     31,308    
Cumulative effect of change in accounting principle       $ 0 $ (191,244)
Ending balance $ 13,152 $ (30,472) $ 168,314