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INVESTMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Amortized cost and estimated fair value of available-for-sale securities [Abstract]      
Fixed maturity securities available-for-sale, Amortized cost $ 1,258,390   $ 1,253,166
Fixed maturity securities available-for-sale 1,256,473   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 35,995    
Due after one year through five years 189,333    
Due after five years through ten years 348,705    
Due after ten years 468,751    
Securities not due at a single maturity date 215,606    
Fixed maturity securities available-for-sale, Amortized cost 1,258,390   1,253,166
Estimated fair value      
Due in one year or less 36,421    
Due after one year through five years 191,111    
Due after five years through ten years 347,330    
Due after ten years 470,731    
Securities not due at a single maturity date 210,880    
Totals 1,256,473   1,275,016
Realized Investment Gains (Losses) [Abstract]      
Fixed maturity securities available-for-sale gross realized gains 234    
Fixed maturity securities available-for-sale gross realized losses (478)    
Equity securities net realized investment gains (losses) 2,716    
Equity securities net unrealized investment gains (losses) on securities still held (9,854)    
Net realized investment gains (losses) and, beginning in 2018, change in unrealized investment gains on equity investments (5,393) $ (627)  
Debt Securities [Member]      
Amortized cost and estimated fair value of available-for-sale securities [Abstract]      
Fixed maturity securities available-for-sale, Amortized cost 1,258,390   1,253,166
Fixed maturity securities available-for-sale, Gross unrealized gains 19,796   33,036
Fixed maturity securities available-for-sale, Gross unrealized losses 21,713   11,186
Fixed maturity securities available-for-sale 1,256,473   1,275,016
Available for sale securities continuous unrealized loss position [Abstract]      
Less than twelve months, Fair value 479,834   232,834
Less than twelve months, Unrealized losses 9,955   2,472
Twelve months or longer, Fair value 186,441   190,985
Twelve months or longer, Unrealized losses 11,758   8,714
Total, Fair value 666,275   423,819
Total, Unrealized losses 21,713   11,186
Amortized cost      
Fixed maturity securities available-for-sale, Amortized cost 1,258,390   1,253,166
Estimated fair value      
Totals 1,256,473   1,275,016
Realized Investment Gains (Losses) [Abstract]      
Available-for-sale, Gross realized investment gains   90  
Available-for-sale, Gross realized investment losses   (1,206)  
US Treasury Securities [Member]      
Amortized cost and estimated fair value of available-for-sale securities [Abstract]      
Fixed maturity securities available-for-sale, Amortized cost 8,121   8,115
Fixed maturity securities available-for-sale, Gross unrealized gains 0   0
Fixed maturity securities available-for-sale, Gross unrealized losses 165   37
Fixed maturity securities available-for-sale 7,956   8,078
Available for sale securities continuous unrealized loss position [Abstract]      
Less than twelve months, Fair value 7,956   8,078
Less than twelve months, Unrealized losses 165   37
Twelve months or longer, Fair value 0   0
Twelve months or longer, Unrealized losses 0   0
Total, Fair value 7,956   8,078
Total, Unrealized losses 165   37
Amortized cost      
Fixed maturity securities available-for-sale, Amortized cost 8,121   8,115
Estimated fair value      
Totals 7,956   8,078
US Government-sponsored Enterprises Debt Securities [Member]      
Amortized cost and estimated fair value of available-for-sale securities [Abstract]      
Fixed maturity securities available-for-sale, Amortized cost 313,212   303,932
Fixed maturity securities available-for-sale, Gross unrealized gains 36   122
Fixed maturity securities available-for-sale, Gross unrealized losses 10,772   6,105
Fixed maturity securities available-for-sale 302,476   297,949
Available for sale securities continuous unrealized loss position [Abstract]      
Less than twelve months, Fair value 159,653   134,284
Less than twelve months, Unrealized losses 3,831   1,491
Twelve months or longer, Fair value 125,284   127,604
Twelve months or longer, Unrealized losses 6,941   4,614
Total, Fair value 284,937   261,888
Total, Unrealized losses 10,772   6,105
Amortized cost      
Fixed maturity securities available-for-sale, Amortized cost 313,212   303,932
Estimated fair value      
Totals 302,476   297,949
US States and Political Subdivisions Debt Securities [Member]      
Amortized cost and estimated fair value of available-for-sale securities [Abstract]      
Fixed maturity securities available-for-sale, Amortized cost 282,149   290,038
Fixed maturity securities available-for-sale, Gross unrealized gains 12,391   17,729
Fixed maturity securities available-for-sale, Gross unrealized losses 609   231
Fixed maturity securities available-for-sale 293,931   307,536
Available for sale securities continuous unrealized loss position [Abstract]      
Less than twelve months, Fair value 11,287   0
Less than twelve months, Unrealized losses 78   0
Twelve months or longer, Fair value 14,057   14,416
Twelve months or longer, Unrealized losses 531   231
Total, Fair value 25,344   14,416
Total, Unrealized losses 609   231
Amortized cost      
Fixed maturity securities available-for-sale, Amortized cost 282,149   290,038
Estimated fair value      
Totals 293,931   307,536
Commercial Mortgage Backed Securities [Member]      
Amortized cost and estimated fair value of available-for-sale securities [Abstract]      
Fixed maturity securities available-for-sale, Amortized cost 79,011   84,058
Fixed maturity securities available-for-sale, Gross unrealized gains 311   591
Fixed maturity securities available-for-sale, Gross unrealized losses 2,662   669
Fixed maturity securities available-for-sale 76,660   83,980
Available for sale securities continuous unrealized loss position [Abstract]      
Less than twelve months, Fair value 61,143   32,155
Less than twelve months, Unrealized losses 1,971   221
Twelve months or longer, Fair value 8,280   8,530
Twelve months or longer, Unrealized losses 691   448
Total, Fair value 69,423   40,685
Total, Unrealized losses 2,662   669
Amortized cost      
Fixed maturity securities available-for-sale, Amortized cost 79,011   84,058
Estimated fair value      
Totals 76,660   83,980
Residential Mortgage Backed Securities [Member]      
Amortized cost and estimated fair value of available-for-sale securities [Abstract]      
Fixed maturity securities available-for-sale, Amortized cost 134,691   120,554
Fixed maturity securities available-for-sale, Gross unrealized gains 1,898   2,479
Fixed maturity securities available-for-sale, Gross unrealized losses 4,239   3,234
Fixed maturity securities available-for-sale 132,350   119,799
Available for sale securities continuous unrealized loss position [Abstract]      
Less than twelve months, Fair value 67,489   30,003
Less than twelve months, Unrealized losses 1,568   394
Twelve months or longer, Fair value 21,858   22,948
Twelve months or longer, Unrealized losses 2,671   2,840
Total, Fair value 89,347   52,951
Total, Unrealized losses 4,239   3,234
Amortized cost      
Fixed maturity securities available-for-sale, Amortized cost 134,691   120,554
Estimated fair value      
Totals 132,350   119,799
Collateralized Debt Obligations [Member]      
Amortized cost and estimated fair value of available-for-sale securities [Abstract]      
Fixed maturity securities available-for-sale, Amortized cost 23,148   23,934
Fixed maturity securities available-for-sale, Gross unrealized gains 418   625
Fixed maturity securities available-for-sale, Gross unrealized losses 818   445
Fixed maturity securities available-for-sale 22,748   24,114
Available for sale securities continuous unrealized loss position [Abstract]      
Less than twelve months, Fair value 5,158   0
Less than twelve months, Unrealized losses 79   0
Twelve months or longer, Fair value 12,963   13,440
Twelve months or longer, Unrealized losses 739   445
Total, Fair value 18,121   13,440
Total, Unrealized losses 818   445
Amortized cost      
Fixed maturity securities available-for-sale, Amortized cost 23,148   23,934
Estimated fair value      
Totals 22,748   24,114
Corporate Debt Securities [Member]      
Amortized cost and estimated fair value of available-for-sale securities [Abstract]      
Fixed maturity securities available-for-sale, Amortized cost 418,058   422,535
Fixed maturity securities available-for-sale, Gross unrealized gains 4,742   11,490
Fixed maturity securities available-for-sale, Gross unrealized losses 2,448   465
Fixed maturity securities available-for-sale 420,352   433,560
Available for sale securities continuous unrealized loss position [Abstract]      
Less than twelve months, Fair value 167,148   28,314
Less than twelve months, Unrealized losses 2,263   329
Twelve months or longer, Fair value 3,999   4,047
Twelve months or longer, Unrealized losses 185   136
Total, Fair value 171,147   32,361
Total, Unrealized losses 2,448   465
Amortized cost      
Fixed maturity securities available-for-sale, Amortized cost 418,058   422,535
Estimated fair value      
Totals 420,352   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]      
Equity securities available-for-sale net realized investment gains (losses) excluding other than temporary impairments   2,776  
Common stocks Financial services [Member]      
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
Common stocks Information technology [Member]      
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
Common stocks Healthcare [Member]      
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
Common stocks Consumer staples [Member]      
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
Common stocks Consumer discretionary [Member]      
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
Common stocks Energy [Member]      
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
Common stocks Industrials [Member]      
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
Common stocks Other [Member]      
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
Nonredeemable Preferred Stock [Member]      
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 $ 1,989 $ (2,287)