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SUMMARY OF INVESTMENTS (Investments in Unrealized Loss Position) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
issue
Dec. 31, 2017
USD ($)
issue
Fixed maturities    
Number of Issues    
Fixed maturities, less than 12 months | issue   88
Fixed maturities, 12 months or longer | issue   112
Fair Value    
Fixed maturities, less than 12 months   $ 232,489
Fixed maturities, 12 months or longer   302,815
Total   535,304
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months   1,791
Fixed maturities, 12 months or longer   7,161
Total   $ 8,952
Fixed maturities | Discontinued Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue   74
Fixed maturities, 12 months or longer | issue   61
Fair Value    
Fixed maturities, less than 12 months   $ 180,891
Fixed maturities, 12 months or longer   167,625
Total   348,516
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months   1,415
Fixed maturities, 12 months or longer   5,906
Total   $ 7,321
Fixed maturities | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 118  
Fixed maturities, 12 months or longer | issue 291  
Fixed maturities, less than 12 months | issue   162
Fixed maturities, 12 months or longer | issue   173
Fair Value    
Fixed maturities, less than 12 months $ 207,671  
Fixed maturities, 12 months or longer 698,835  
Fixed maturities, total 906,506  
Fixed maturities, less than 12 months   $ 413,380
Fixed maturities, 12 months or longer   470,440
Total   883,820
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 3,067  
Fixed maturities, 12 months or longer 20,578  
Fixed maturities, total $ 23,645  
Fixed maturities, less than 12 months   3,206
Fixed maturities, 12 months or longer   13,067
Total   $ 16,273
U.S. Treasury | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 1  
Fixed maturities, 12 months or longer | issue 5  
Fixed maturities, less than 12 months | issue   5
Fixed maturities, 12 months or longer | issue   2
Fair Value    
Fixed maturities, less than 12 months $ 8,018  
Fixed maturities, 12 months or longer 14,645  
Fixed maturities, total 22,663  
Fixed maturities, less than 12 months   $ 10,370
Fixed maturities, 12 months or longer   5,765
Total   16,135
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 7  
Fixed maturities, 12 months or longer 213  
Fixed maturities, total $ 220  
Fixed maturities, less than 12 months   67
Fixed maturities, 12 months or longer   119
Total   $ 186
U.S. government agency | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 4  
Fixed maturities, 12 months or longer | issue 17  
Fixed maturities, less than 12 months | issue   11
Fixed maturities, 12 months or longer | issue   5
Fair Value    
Fixed maturities, less than 12 months $ 17,907  
Fixed maturities, 12 months or longer 80,696  
Fixed maturities, total 98,603  
Fixed maturities, less than 12 months   $ 64,842
Fixed maturities, 12 months or longer   19,372
Total   84,214
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 81  
Fixed maturities, 12 months or longer 1,668  
Fixed maturities, total $ 1,749  
Fixed maturities, less than 12 months   390
Fixed maturities, 12 months or longer   327
Total   $ 717
General obligations | Midwest | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 2  
Fixed maturities, 12 months or longer | issue 7  
Fixed maturities, less than 12 months | issue   2
Fixed maturities, 12 months or longer | issue   3
Fair Value    
Fixed maturities, less than 12 months $ 2,939  
Fixed maturities, 12 months or longer 23,749  
Fixed maturities, total 26,688  
Fixed maturities, less than 12 months   $ 2,177
Fixed maturities, 12 months or longer   19,729
Total   21,906
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 5  
Fixed maturities, 12 months or longer 680  
Fixed maturities, total $ 685  
Fixed maturities, less than 12 months   8
Fixed maturities, 12 months or longer   431
Total   $ 439
General obligations | Northeast | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 0  
Fixed maturities, 12 months or longer | issue 3  
Fixed maturities, less than 12 months | issue   0
Fixed maturities, 12 months or longer | issue   1
Fair Value    
Fixed maturities, less than 12 months $ 0  
Fixed maturities, 12 months or longer 12,110  
Fixed maturities, total 12,110  
Fixed maturities, less than 12 months   $ 0
Fixed maturities, 12 months or longer   3,644
Total   3,644
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 0  
Fixed maturities, 12 months or longer 103  
Fixed maturities, total $ 103  
Fixed maturities, less than 12 months   0
Fixed maturities, 12 months or longer   10
Total   $ 10
General obligations | South | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 1  
Fixed maturities, 12 months or longer | issue 22  
Fixed maturities, less than 12 months | issue   3
Fixed maturities, 12 months or longer | issue   11
Fair Value    
Fixed maturities, less than 12 months $ 778  
Fixed maturities, 12 months or longer 50,174  
Fixed maturities, total 50,952  
Fixed maturities, less than 12 months   $ 7,959
Fixed maturities, 12 months or longer   29,545
Total   37,504
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 2  
Fixed maturities, 12 months or longer 1,551  
Fixed maturities, total $ 1,553  
Fixed maturities, less than 12 months   32
Fixed maturities, 12 months or longer   781
Total   $ 813
General obligations | West | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 1  
Fixed maturities, 12 months or longer | issue 16  
Fixed maturities, less than 12 months | issue   2
Fixed maturities, 12 months or longer | issue   8
Fair Value    
Fixed maturities, less than 12 months $ 1,203  
Fixed maturities, 12 months or longer 48,499  
Fixed maturities, total 49,702  
Fixed maturities, less than 12 months   $ 5,944
Fixed maturities, 12 months or longer   25,755
Total   31,699
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 5  
Fixed maturities, 12 months or longer 1,170  
Fixed maturities, total $ 1,175  
Fixed maturities, less than 12 months   18
Fixed maturities, 12 months or longer   445
Total   $ 463
Special revenue | Midwest | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 4  
Fixed maturities, 12 months or longer | issue 19  
Fixed maturities, less than 12 months | issue   2
Fixed maturities, 12 months or longer | issue   7
Fair Value    
Fixed maturities, less than 12 months $ 3,892  
Fixed maturities, 12 months or longer 43,854  
Fixed maturities, total 47,746  
Fixed maturities, less than 12 months   $ 3,486
Fixed maturities, 12 months or longer   19,130
Total   22,616
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 8  
Fixed maturities, 12 months or longer 862  
Fixed maturities, total $ 870  
Fixed maturities, less than 12 months   15
Fixed maturities, 12 months or longer   336
Total   $ 351
Special revenue | Northeast | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 0  
Fixed maturities, 12 months or longer | issue 14  
Fixed maturities, less than 12 months | issue   1
Fixed maturities, 12 months or longer | issue   11
Fair Value    
Fixed maturities, less than 12 months $ 0  
Fixed maturities, 12 months or longer 37,629  
Fixed maturities, total 37,629  
Fixed maturities, less than 12 months   $ 4,471
Fixed maturities, 12 months or longer   28,476
Total   32,947
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 0  
Fixed maturities, 12 months or longer 1,241  
Fixed maturities, total $ 1,241  
Fixed maturities, less than 12 months   37
Fixed maturities, 12 months or longer   582
Total   $ 619
Special revenue | South | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 4  
Fixed maturities, 12 months or longer | issue 45  
Fixed maturities, less than 12 months | issue   8
Fixed maturities, 12 months or longer | issue   27
Fair Value    
Fixed maturities, less than 12 months $ 4,298  
Fixed maturities, 12 months or longer 107,016  
Fixed maturities, total 111,314  
Fixed maturities, less than 12 months   $ 7,749
Fixed maturities, 12 months or longer   69,917
Total   77,666
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 30  
Fixed maturities, 12 months or longer 3,678  
Fixed maturities, total $ 3,708  
Fixed maturities, less than 12 months   107
Fixed maturities, 12 months or longer   1,744
Total   $ 1,851
Special revenue | West | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 4  
Fixed maturities, 12 months or longer | issue 28  
Fixed maturities, less than 12 months | issue   3
Fixed maturities, 12 months or longer | issue   22
Fair Value    
Fixed maturities, less than 12 months $ 11,115  
Fixed maturities, 12 months or longer 69,667  
Fixed maturities, total 80,782  
Fixed maturities, less than 12 months   $ 5,424
Fixed maturities, 12 months or longer   56,753
Total   62,177
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 32  
Fixed maturities, 12 months or longer 2,171  
Fixed maturities, total $ 2,203  
Fixed maturities, less than 12 months   16
Fixed maturities, 12 months or longer   1,182
Total   $ 1,198
Foreign bonds    
Number of Issues    
Fixed maturities, less than 12 months | issue   1
Fixed maturities, 12 months or longer | issue   0
Fair Value    
Fixed maturities, less than 12 months   $ 857
Fixed maturities, 12 months or longer   0
Total   857
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months   49
Fixed maturities, 12 months or longer   0
Total   $ 49
Foreign bonds | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 1  
Fixed maturities, 12 months or longer | issue 0  
Fair Value    
Fixed maturities, less than 12 months $ 2,984  
Fixed maturities, 12 months or longer 0  
Fixed maturities, total 2,984  
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 13  
Fixed maturities, 12 months or longer 0  
Fixed maturities, total $ 13  
Public utilities | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 12  
Fixed maturities, 12 months or longer | issue 8  
Fixed maturities, less than 12 months | issue   8
Fixed maturities, 12 months or longer | issue   5
Fair Value    
Fixed maturities, less than 12 months $ 25,781  
Fixed maturities, 12 months or longer 17,253  
Fixed maturities, total 43,034  
Fixed maturities, less than 12 months   $ 19,186
Fixed maturities, 12 months or longer   8,446
Total   27,632
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 552  
Fixed maturities, 12 months or longer 471  
Fixed maturities, total $ 1,023  
Fixed maturities, less than 12 months   79
Fixed maturities, 12 months or longer   191
Total   $ 270
Corporate bonds | Financial services | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 13  
Fixed maturities, 12 months or longer | issue 13  
Fixed maturities, less than 12 months | issue   22
Fixed maturities, 12 months or longer | issue   4
Fair Value    
Fixed maturities, less than 12 months $ 30,177  
Fixed maturities, 12 months or longer 32,855  
Fixed maturities, total 63,032  
Fixed maturities, less than 12 months   $ 50,144
Fixed maturities, 12 months or longer   11,389
Total   61,533
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 650  
Fixed maturities, 12 months or longer 1,525  
Fixed maturities, total $ 2,175  
Fixed maturities, less than 12 months   256
Fixed maturities, 12 months or longer   186
Total   $ 442
Corporate bonds | Energy | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 7  
Fixed maturities, 12 months or longer | issue 2  
Fixed maturities, less than 12 months | issue   1
Fixed maturities, 12 months or longer | issue   1
Fair Value    
Fixed maturities, less than 12 months $ 12,556  
Fixed maturities, 12 months or longer 4,099  
Fixed maturities, total 16,655  
Fixed maturities, less than 12 months   $ 2,236
Fixed maturities, 12 months or longer   1,606
Total   3,842
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 148  
Fixed maturities, 12 months or longer 156  
Fixed maturities, total $ 304  
Fixed maturities, less than 12 months   13
Fixed maturities, 12 months or longer   97
Total   $ 110
Corporate bonds | Industrials | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 9  
Fixed maturities, 12 months or longer | issue 4  
Fixed maturities, less than 12 months | issue   10
Fixed maturities, 12 months or longer | issue   2
Fair Value    
Fixed maturities, less than 12 months $ 21,970  
Fixed maturities, 12 months or longer 11,040  
Fixed maturities, total 33,010  
Fixed maturities, less than 12 months   $ 27,773
Fixed maturities, 12 months or longer   4,275
Total   32,048
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 397  
Fixed maturities, 12 months or longer 509  
Fixed maturities, total $ 906  
Fixed maturities, less than 12 months   146
Fixed maturities, 12 months or longer   95
Total   $ 241
Corporate bonds | Consumer goods and services | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 14  
Fixed maturities, 12 months or longer | issue 5  
Fixed maturities, less than 12 months | issue   14
Fixed maturities, 12 months or longer | issue   3
Fair Value    
Fixed maturities, less than 12 months $ 30,399  
Fixed maturities, 12 months or longer 9,554  
Fixed maturities, total 39,953  
Fixed maturities, less than 12 months   $ 32,781
Fixed maturities, 12 months or longer   6,813
Total   39,594
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 527  
Fixed maturities, 12 months or longer 292  
Fixed maturities, total $ 819  
Fixed maturities, less than 12 months   248
Fixed maturities, 12 months or longer   246
Total   $ 494
Corporate bonds | Health care | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 3  
Fixed maturities, 12 months or longer | issue 1  
Fixed maturities, less than 12 months | issue   4
Fixed maturities, 12 months or longer | issue   0
Fair Value    
Fixed maturities, less than 12 months $ 6,203  
Fixed maturities, 12 months or longer 345  
Fixed maturities, total 6,548  
Fixed maturities, less than 12 months   $ 9,947
Fixed maturities, 12 months or longer   0
Total   9,947
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 97  
Fixed maturities, 12 months or longer 8  
Fixed maturities, total $ 105  
Fixed maturities, less than 12 months   29
Fixed maturities, 12 months or longer   0
Total   $ 29
Corporate bonds | Technology, media and telecommunications | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 6  
Fixed maturities, 12 months or longer | issue 5  
Fixed maturities, less than 12 months | issue   12
Fixed maturities, 12 months or longer | issue   3
Fair Value    
Fixed maturities, less than 12 months $ 12,638  
Fixed maturities, 12 months or longer 9,619  
Fixed maturities, total 22,257  
Fixed maturities, less than 12 months   $ 35,319
Fixed maturities, 12 months or longer   10,413
Total   45,732
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 288  
Fixed maturities, 12 months or longer 390  
Fixed maturities, total $ 678  
Fixed maturities, less than 12 months   122
Fixed maturities, 12 months or longer   128
Total   $ 250
Mortgage-backed securities | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 22  
Fixed maturities, 12 months or longer | issue 22  
Fixed maturities, less than 12 months | issue   10
Fixed maturities, 12 months or longer | issue   10
Fair Value    
Fixed maturities, less than 12 months $ 1,539  
Fixed maturities, 12 months or longer 4,166  
Fixed maturities, total 5,705  
Fixed maturities, less than 12 months   $ 2,458
Fixed maturities, 12 months or longer   6,641
Total   9,099
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 34  
Fixed maturities, 12 months or longer 198  
Fixed maturities, total $ 232  
Fixed maturities, less than 12 months   18
Fixed maturities, 12 months or longer   220
Total   $ 238
Collateralized mortgage obligations | Government national mortgage association | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 2  
Fixed maturities, 12 months or longer | issue 22  
Fixed maturities, less than 12 months | issue   20
Fixed maturities, 12 months or longer | issue   17
Fair Value    
Fixed maturities, less than 12 months $ 3,797  
Fixed maturities, 12 months or longer 44,690  
Fixed maturities, total 48,487  
Fixed maturities, less than 12 months   $ 49,764
Fixed maturities, 12 months or longer   46,969
Total   96,733
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 55  
Fixed maturities, 12 months or longer 1,679  
Fixed maturities, total $ 1,734  
Fixed maturities, less than 12 months   629
Fixed maturities, 12 months or longer   1,645
Total   $ 2,274
Collateralized mortgage obligations | Federal home loan mortgage corporation | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 3  
Fixed maturities, 12 months or longer | issue 18  
Fixed maturities, less than 12 months | issue   11
Fixed maturities, 12 months or longer | issue   20
Fair Value    
Fixed maturities, less than 12 months $ 4,541  
Fixed maturities, 12 months or longer 38,189  
Fixed maturities, total 42,730  
Fixed maturities, less than 12 months   $ 37,543
Fixed maturities, 12 months or longer   75,679
Total   113,222
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 20  
Fixed maturities, 12 months or longer 1,284  
Fixed maturities, total $ 1,304  
Fixed maturities, less than 12 months   577
Fixed maturities, 12 months or longer   3,470
Total   $ 4,047
Collateralized mortgage obligations | Federal national mortgage association | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 4  
Fixed maturities, 12 months or longer | issue 15  
Fixed maturities, less than 12 months | issue   11
Fixed maturities, 12 months or longer | issue   11
Fair Value    
Fixed maturities, less than 12 months $ 2,107  
Fixed maturities, 12 months or longer 38,986  
Fixed maturities, total 41,093  
Fixed maturities, less than 12 months   $ 31,958
Fixed maturities, 12 months or longer   20,123
Total   52,081
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 3  
Fixed maturities, 12 months or longer 729  
Fixed maturities, total $ 732  
Fixed maturities, less than 12 months   342
Fixed maturities, 12 months or longer   832
Total   $ 1,174
Asset-backed securities | Continuing and Discontinuing Operations    
Number of Issues    
Fixed maturities, less than 12 months | issue 1  
Fixed maturities, 12 months or longer | issue 0  
Fixed maturities, less than 12 months | issue   1
Fixed maturities, 12 months or longer | issue   0
Fair Value    
Fixed maturities, less than 12 months $ 2,829  
Fixed maturities, 12 months or longer 0  
Fixed maturities, total 2,829  
Fixed maturities, less than 12 months   $ 992
Fixed maturities, 12 months or longer   0
Total   992
Gross Unrealized Depreciation    
Fixed maturities, less than 12 months 113  
Fixed maturities, 12 months or longer 0  
Fixed maturities, total $ 113  
Fixed maturities, less than 12 months   8
Fixed maturities, 12 months or longer   0
Total   $ 8