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INVESTMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Amortized cost and estimated fair value of available-for-sale securities [Abstract]          
Fixed maturity securities available-for-sale, Amortized cost $ 1,264,975   $ 1,264,975   $ 1,253,166
Fixed maturity securities available-for-sale 1,248,072   1,248,072   1,275,016
Equity securities available-for-sale, Amortized cost         144,274
Equity securities available-for-sale         228,115
Available-for-sale securities, Amortized cost         1,397,440
Available-for-sale securities, Gross unrealized gains         118,284
Available-for-sale securities, Gross unrealized losses         12,593
Available-for-sale securities         1,503,131
Available for sale securities continuous unrealized loss position [Abstract]          
Less than twelve months, Fair value         247,865
Less than twelve months, Unrealized losses         3,840
Twelve months or longer, Fair value         192,946
Twelve months or longer, Unrealized losses         8,753
Total, Fair value         440,811
Total, Unrealized losses         12,593
Amortized cost          
Due in one year or less 40,384   40,384    
Due after one year through five years 224,706   224,706    
Due after five years through ten years 365,415   365,415    
Due after ten years 404,097   404,097    
Securities not due at a single maturity date 230,373   230,373    
Fixed maturity securities available-for-sale, Amortized cost 1,264,975   1,264,975   1,253,166
Estimated fair value          
Due in one year or less 40,719   40,719    
Due after one year through five years 225,537   225,537    
Due after five years through ten years 360,172   360,172    
Due after ten years 398,067   398,067    
Securities not due at a single maturity date 223,577   223,577    
Totals 1,248,072   1,248,072   1,275,016
Realized Investment Gains (Losses) [Abstract]          
Fixed maturity securities available-for-sale gross realized gains 90   324    
Fixed maturity securities available-for-sale gross realized losses (1,050)   (7,018)    
Equity securities: 4,325   8,520    
Change in unrealized investment gains 9,502   (799)    
Net realized investment gains (losses) and, beginning in 2018, change in unrealized investment gains on equity investments 11,135 $ (594) (118) $ 2,166  
Debt Securities [Member]          
Amortized cost and estimated fair value of available-for-sale securities [Abstract]          
Fixed maturity securities available-for-sale, Amortized cost 1,264,975   1,264,975   1,253,166
Fixed maturity securities available-for-sale, Gross unrealized gains 13,918   13,918   33,036
Fixed maturity securities available-for-sale, Gross unrealized losses 30,821   30,821   11,186
Fixed maturity securities available-for-sale 1,248,072   1,248,072   1,275,016
Available for sale securities continuous unrealized loss position [Abstract]          
Less than twelve months, Fair value 530,648   530,648   232,834
Less than twelve months, Unrealized losses 14,297   14,297   2,472
Twelve months or longer, Fair value 238,271   238,271   190,985
Twelve months or longer, Unrealized losses 16,524   16,524   8,714
Total, Fair value 768,919   768,919   423,819
Total, Unrealized losses 30,821   30,821   11,186
Amortized cost          
Fixed maturity securities available-for-sale, Amortized cost 1,264,975   1,264,975   1,253,166
Estimated fair value          
Totals 1,248,072   1,248,072   1,275,016
Realized Investment Gains (Losses) [Abstract]          
Available-for-sale, Gross realized investment gains   29   408  
Available-for-sale, Gross realized investment losses   (230)   (2,316)  
U.S. treasury          
Amortized cost and estimated fair value of available-for-sale securities [Abstract]          
Fixed maturity securities available-for-sale, Amortized cost 8,133   8,133   8,115
Fixed maturity securities available-for-sale, Gross unrealized gains 0   0   0
Fixed maturity securities available-for-sale, Gross unrealized losses 275   275   37
Fixed maturity securities available-for-sale 7,858   7,858   8,078
Available for sale securities continuous unrealized loss position [Abstract]          
Less than twelve months, Fair value 7,621   7,621   8,078
Less than twelve months, Unrealized losses 263   263   37
Twelve months or longer, Fair value 237   237   0
Twelve months or longer, Unrealized losses 12   12   0
Total, Fair value 7,858   7,858   8,078
Total, Unrealized losses 275   275   37
Amortized cost          
Fixed maturity securities available-for-sale, Amortized cost 8,133   8,133   8,115
Estimated fair value          
Totals 7,858   7,858   8,078
U.S. government-sponsored agencies          
Amortized cost and estimated fair value of available-for-sale securities [Abstract]          
Fixed maturity securities available-for-sale, Amortized cost 305,159   305,159   303,932
Fixed maturity securities available-for-sale, Gross unrealized gains 0   0   122
Fixed maturity securities available-for-sale, Gross unrealized losses 15,102   15,102   6,105
Fixed maturity securities available-for-sale 290,057   290,057   297,949
Available for sale securities continuous unrealized loss position [Abstract]          
Less than twelve months, Fair value 145,814   145,814   134,284
Less than twelve months, Unrealized losses 5,252   5,252   1,491
Twelve months or longer, Fair value 144,243   144,243   127,604
Twelve months or longer, Unrealized losses 9,850   9,850   4,614
Total, Fair value 290,057   290,057   261,888
Total, Unrealized losses 15,102   15,102   6,105
Amortized cost          
Fixed maturity securities available-for-sale, Amortized cost 305,159   305,159   303,932
Estimated fair value          
Totals 290,057   290,057   297,949
Obligations of states and political subdivisions          
Amortized cost and estimated fair value of available-for-sale securities [Abstract]          
Fixed maturity securities available-for-sale, Amortized cost 274,342   274,342   290,038
Fixed maturity securities available-for-sale, Gross unrealized gains 8,773   8,773   17,729
Fixed maturity securities available-for-sale, Gross unrealized losses 808   808   231
Fixed maturity securities available-for-sale 282,307   282,307   307,536
Available for sale securities continuous unrealized loss position [Abstract]          
Less than twelve months, Fair value 21,833   21,833   0
Less than twelve months, Unrealized losses 185   185   0
Twelve months or longer, Fair value 11,881   11,881   14,416
Twelve months or longer, Unrealized losses 623   623   231
Total, Fair value 33,714   33,714   14,416
Total, Unrealized losses 808   808   231
Amortized cost          
Fixed maturity securities available-for-sale, Amortized cost 274,342   274,342   290,038
Estimated fair value          
Totals 282,307   282,307   307,536
Commercial mortgage-backed          
Amortized cost and estimated fair value of available-for-sale securities [Abstract]          
Fixed maturity securities available-for-sale, Amortized cost 78,943   78,943   84,058
Fixed maturity securities available-for-sale, Gross unrealized gains 209   209   591
Fixed maturity securities available-for-sale, Gross unrealized losses 3,838   3,838   669
Fixed maturity securities available-for-sale 75,314   75,314   83,980
Available for sale securities continuous unrealized loss position [Abstract]          
Less than twelve months, Fair value 43,343   43,343   32,155
Less than twelve months, Unrealized losses 2,014   2,014   221
Twelve months or longer, Fair value 24,829   24,829   8,530
Twelve months or longer, Unrealized losses 1,824   1,824   448
Total, Fair value 68,172   68,172   40,685
Total, Unrealized losses 3,838   3,838   669
Amortized cost          
Fixed maturity securities available-for-sale, Amortized cost 78,943   78,943   84,058
Estimated fair value          
Totals 75,314   75,314   83,980
Residential mortgage-backed          
Amortized cost and estimated fair value of available-for-sale securities [Abstract]          
Fixed maturity securities available-for-sale, Amortized cost 149,847   149,847   120,554
Fixed maturity securities available-for-sale, Gross unrealized gains 1,925   1,925   2,479
Fixed maturity securities available-for-sale, Gross unrealized losses 5,047   5,047   3,234
Fixed maturity securities available-for-sale 146,725   146,725   119,799
Available for sale securities continuous unrealized loss position [Abstract]          
Less than twelve months, Fair value 89,534   89,534   30,003
Less than twelve months, Unrealized losses 2,439   2,439   394
Twelve months or longer, Fair value 33,240   33,240   22,948
Twelve months or longer, Unrealized losses 2,608   2,608   2,840
Total, Fair value 122,774   122,774   52,951
Total, Unrealized losses 5,047   5,047   3,234
Amortized cost          
Fixed maturity securities available-for-sale, Amortized cost 149,847   149,847   120,554
Estimated fair value          
Totals 146,725   146,725   119,799
Other asset-backed          
Amortized cost and estimated fair value of available-for-sale securities [Abstract]          
Fixed maturity securities available-for-sale, Amortized cost 22,165   22,165   23,934
Fixed maturity securities available-for-sale, Gross unrealized gains 313   313   625
Fixed maturity securities available-for-sale, Gross unrealized losses 1,149   1,149   445
Fixed maturity securities available-for-sale 21,329   21,329   24,114
Available for sale securities continuous unrealized loss position [Abstract]          
Less than twelve months, Fair value 4,969   4,969   0
Less than twelve months, Unrealized losses 124   124   0
Twelve months or longer, Fair value 11,985   11,985   13,440
Twelve months or longer, Unrealized losses 1,025   1,025   445
Total, Fair value 16,954   16,954   13,440
Total, Unrealized losses 1,149   1,149   445
Amortized cost          
Fixed maturity securities available-for-sale, Amortized cost 22,165   22,165   23,934
Estimated fair value          
Totals 21,329   21,329   24,114
Corporate          
Amortized cost and estimated fair value of available-for-sale securities [Abstract]          
Fixed maturity securities available-for-sale, Amortized cost 426,386   426,386   422,535
Fixed maturity securities available-for-sale, Gross unrealized gains 2,698   2,698   11,490
Fixed maturity securities available-for-sale, Gross unrealized losses 4,602   4,602   465
Fixed maturity securities available-for-sale 424,482   424,482   433,560
Available for sale securities continuous unrealized loss position [Abstract]          
Less than twelve months, Fair value 217,534   217,534   28,314
Less than twelve months, Unrealized losses 4,020   4,020   329
Twelve months or longer, Fair value 11,856   11,856   4,047
Twelve months or longer, Unrealized losses 582   582   136
Total, Fair value 229,390   229,390   32,361
Total, Unrealized losses 4,602   4,602   465
Amortized cost          
Fixed maturity securities available-for-sale, Amortized cost 426,386   426,386   422,535
Estimated fair value          
Totals 424,482   424,482   433,560
Equity Securities [Member]          
Amortized cost and estimated fair value of available-for-sale securities [Abstract]          
Equity securities available-for-sale, Amortized cost         144,274
Equity securities available-for-sale, Gross unrealized gains         85,248
Equity securities available-for-sale, Gross unrealized loss         1,407
Equity securities available-for-sale         228,115
Available for sale securities continuous unrealized loss position [Abstract]          
Less than twelve months, Fair value         15,031
Less than twelve months, Unrealized losses         1,368
Twelve months or longer, Fair value         1,961
Twelve months or longer, Unrealized losses         39
Total, Fair value         16,992
Total, Unrealized losses         1,407
Realized Investment Gains (Losses) [Abstract]          
Net realized investment gains, excluding other-than-temporary impairments   961   9,763  
Other-than-temporary impairments   (355)   (1,088)  
Financial services          
Amortized cost and estimated fair value of available-for-sale securities [Abstract]          
Equity securities available-for-sale, Amortized cost         30,103
Equity securities available-for-sale, Gross unrealized gains         13,594
Equity securities available-for-sale, Gross unrealized loss         175
Equity securities available-for-sale         43,522
Available for sale securities continuous unrealized loss position [Abstract]          
Less than twelve months, Fair value         4,391
Less than twelve months, Unrealized losses         175
Twelve months or longer, Fair value         0
Twelve months or longer, Unrealized losses         0
Total, Fair value         4,391
Total, Unrealized losses         175
Information technology          
Amortized cost and estimated fair value of available-for-sale securities [Abstract]          
Equity securities available-for-sale, Amortized cost         18,308
Equity securities available-for-sale, Gross unrealized gains         17,504
Equity securities available-for-sale, Gross unrealized loss         2
Equity securities available-for-sale         35,810
Available for sale securities continuous unrealized loss position [Abstract]          
Less than twelve months, Fair value         344
Less than twelve months, Unrealized losses         2
Twelve months or longer, Fair value         0
Twelve months or longer, Unrealized losses         0
Total, Fair value         344
Total, Unrealized losses         2
Healthcare          
Amortized cost and estimated fair value of available-for-sale securities [Abstract]          
Equity securities available-for-sale, Amortized cost         18,877
Equity securities available-for-sale, Gross unrealized gains         11,876
Equity securities available-for-sale, Gross unrealized loss         158
Equity securities available-for-sale         30,595
Available for sale securities continuous unrealized loss position [Abstract]          
Less than twelve months, Fair value         2,532
Less than twelve months, Unrealized losses         158
Twelve months or longer, Fair value         0
Twelve months or longer, Unrealized losses         0
Total, Fair value         2,532
Total, Unrealized losses         158
Consumer staples          
Amortized cost and estimated fair value of available-for-sale securities [Abstract]          
Equity securities available-for-sale, Amortized cost         9,275
Equity securities available-for-sale, Gross unrealized gains         4,917
Equity securities available-for-sale, Gross unrealized loss         65
Equity securities available-for-sale         14,127
Available for sale securities continuous unrealized loss position [Abstract]          
Less than twelve months, Fair value         575
Less than twelve months, Unrealized losses         65
Twelve months or longer, Fair value         0
Twelve months or longer, Unrealized losses         0
Total, Fair value         575
Total, Unrealized losses         65
Consumer discretionary          
Amortized cost and estimated fair value of available-for-sale securities [Abstract]          
Equity securities available-for-sale, Amortized cost         10,935
Equity securities available-for-sale, Gross unrealized gains         9,640
Equity securities available-for-sale, Gross unrealized loss         37
Equity securities available-for-sale         20,538
Available for sale securities continuous unrealized loss position [Abstract]          
Less than twelve months, Fair value         992
Less than twelve months, Unrealized losses         37
Twelve months or longer, Fair value         0
Twelve months or longer, Unrealized losses         0
Total, Fair value         992
Total, Unrealized losses         37
Energy          
Amortized cost and estimated fair value of available-for-sale securities [Abstract]          
Equity securities available-for-sale, Amortized cost         12,441
Equity securities available-for-sale, Gross unrealized gains         5,381
Equity securities available-for-sale, Gross unrealized loss         917
Equity securities available-for-sale         16,905
Available for sale securities continuous unrealized loss position [Abstract]          
Less than twelve months, Fair value         3,181
Less than twelve months, Unrealized losses         917
Twelve months or longer, Fair value         0
Twelve months or longer, Unrealized losses         0
Total, Fair value         3,181
Total, Unrealized losses         917
Industrials          
Amortized cost and estimated fair value of available-for-sale securities [Abstract]          
Equity securities available-for-sale, Amortized cost         12,746
Equity securities available-for-sale, Gross unrealized gains         15,757
Equity securities available-for-sale, Gross unrealized loss         14
Equity securities available-for-sale         28,489
Available for sale securities continuous unrealized loss position [Abstract]          
Less than twelve months, Fair value         3,016
Less than twelve months, Unrealized losses         14
Twelve months or longer, Fair value         0
Twelve months or longer, Unrealized losses         0
Total, Fair value         3,016
Total, Unrealized losses         14
Other          
Amortized cost and estimated fair value of available-for-sale securities [Abstract]          
Equity securities available-for-sale, Amortized cost         11,058
Equity securities available-for-sale, Gross unrealized gains         5,363
Equity securities available-for-sale, Gross unrealized loss         0
Equity securities available-for-sale         16,421
Non-redeemable preferred stocks          
Amortized cost and estimated fair value of available-for-sale securities [Abstract]          
Equity securities available-for-sale, Amortized cost         20,531
Equity securities available-for-sale, Gross unrealized gains         1,216
Equity securities available-for-sale, Gross unrealized loss         39
Equity securities available-for-sale         21,708
Available for sale securities continuous unrealized loss position [Abstract]          
Less than twelve months, Fair value         0
Less than twelve months, Unrealized losses         0
Twelve months or longer, Fair value         1,961
Twelve months or longer, Unrealized losses         39
Total, Fair value         1,961
Total, Unrealized losses         $ 39
Other Long-term Investments [Member]          
Realized Investment Gains (Losses) [Abstract]          
Net realized investment gains (losses) and, beginning in 2018, change in unrealized investment gains on equity investments $ (1,732) $ (999) $ (1,145) $ (4,601)