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Investments (Tables)
 6 Months Ended
Jun. 30, 2020
Investments Including Short Term And Cash And Cash Equivalents [Abstract]  
Investments Including Short Term And Cash And Cash Equivalents [Table Text Block]
The Company invests primarily in fixed maturity securities, which totaled 89.2% of total cash and invested assets at June 30, 2020, as shown below.

Carrying Value
(In thousands, except for %)
June 30, 2020December 31, 2019
Amount%Amount%
Cash and invested assets:
Fixed maturity securities$1,417,317  89.2 %$1,377,959  90.2 %
Equity securities20,698  1.3 %16,033  1.1 %
Policy loans84,171  5.3 %82,005  5.4 %
Real estate and other long-term investments12,023  0.8 %2,956  0.2 %
Short-term investments—  — %1,301  0.1 %
Cash and cash equivalents52,375  3.4 %46,205  3.0 %
Total cash and invested assets$1,586,584  100.0 %$1,526,459  100.0 %
Debt and Equity Securities, Unrealized Gain (Loss)  
Unrealized Gain (Loss) on Investments [Table Text Block]
The following tables represent the amortized cost, gross unrealized gains and losses and fair value of fixed maturities as of the dates indicated.
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
June 30, 2020
(In thousands)
Fixed maturity securities:    
Available-for-sale:    
U.S. Treasury securities$9,570  2,070  —  11,640  
U.S. Government-sponsored enterprises3,503  1,378  —  4,881  
States and political subdivisions427,529  28,965  675  455,819  
Corporate:
Financial193,818  20,018  555  213,281  
Consumer157,302  20,113  1,450  175,965  
Energy81,201  4,854  1,904  84,151  
All Other255,584  27,951  1,048  282,487  
Commercial mortgage-backed278  —  7  271  
Residential mortgage-backed118,250  23,467  —  141,717  
Asset-backed48,491  165  1,672  46,984  
Foreign governments102  19  —  121  
Total fixed maturity securities$1,295,628  129,000  7,311  1,417,317  

Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
December 31, 2019
(In thousands)
Fixed maturity securities:    
Available-for-sale:    
U.S. Treasury securities$9,709  1,638  —  11,347  
U.S. Government-sponsored enterprises3,516  1,015  —  4,531  
States and political subdivisions512,239  24,285  240  536,284  
Corporate:
Financial169,146  13,094  135  182,105  
Consumer148,575  12,591  464  160,702  
Energy74,315  4,765  115  78,965  
All Other212,714  16,022  420  228,316  
Commercial mortgage-backed1,105  —  5  1,100  
Residential mortgage-backed118,130  12,223  66  130,287  
Asset-backed44,302  11  110  44,203  
Foreign governments102  17  —  119  
Total fixed maturity securities$1,293,853  85,661  1,555  1,377,959  
Equity Securities, Restricted  
Schedule of Equity Securities [Table Text Block]
Most of the Company's equity securities are diversified stock and bond mutual funds.
 
Fair Value
(In thousands)
June 30, 2020December 31, 2019
Equity securities: 
Stock mutual funds$2,796  3,274  
Bond mutual funds11,810  12,311  
Common stock1,064  134  
Non-redeemable preferred stock5,028  314  
Total equity securities$20,698  16,033  
Unrealized Continuous Losses on Investments [Abstract]  
Schedule of Unrealized Loss on Investments [Table Text Block]
The following table presents the fair values and gross unrealized losses of fixed maturity securities that are not deemed to have credit losses, aggregated by investment category and length of time that individual securities have been in a continuous loss position at June 30, 2020.

June 30, 2020Less than 12 monthsGreater than 12 monthsTotal
(In thousands, except for # of securities)Fair
Value		Unrealized
Losses		# of
Securities		Fair
Value		Unrealized
Losses		# of
Securities		Fair
Value		Unrealized
Losses		# of
Securities
Fixed maturities:         
Available-for-sale securities:         
States and political subdivisions$15,281  640  19  $525  35  2  $15,806  675  21  
Corporate:
Financial24,114  555  25  —  —  —  24,114  555  25  
Consumer22,907  1,121  21  1,368  329  1  24,275  1,450  22  
Energy26,644  1,904  34  —  —  —  26,644  1,904  34  
All Other29,026  1,048  33  —  —  —  29,026  1,048  33  
Commercial mortgage-backed218  7  1  —  —  —  218  7  1  
Residential mortgage-backed86  —  1  —  —  —  86  —  1  
Asset-backed42,222  1,672  40  —  —  —  42,222  1,672  40  
Total fixed maturities$160,498  6,947  174  $1,893  364  3  $162,391  7,311  177  
The following table presents the fair values and gross unrealized losses of fixed maturity securities that are not deemed to have other than temporary impairments ("OTTI"), aggregated by investment category and length of time that individual securities have been in a continuous loss position at December 31, 2019.

December 31, 2019Less than 12 monthsGreater than 12 monthsTotal
(In thousands, except for # of securities)Fair
Value		Unrealized
Losses		# of
Securities		Fair
Value		Unrealized
Losses		# of
Securities		Fair
Value		Unrealized
Losses		# of
Securities
Fixed maturities:         
Available-for-sale securities:         
States and political subdivisions$24,064  163  24  $1,961  77  6  $26,025  240  30  
Corporate:
Financial13,581  135  15  —  —  —  13,581  135  15  
Consumer22,671  464  20  —  —  —  22,671  464  20  
Energy4,208  34  4  898  81  2  5,106  115  6  
All Other22,437  285  30  2,771  135  3  25,208  420  33  
Commercial mortgage-backed1,100  5  2  —  —  —  1,100  5  2  
Residential mortgage-backed1,656  65  11  91  1  3  1,747  66  14  
Asset-backed36,039  110  27  —  —  —  36,039  110  27  
Total fixed maturities$125,756  1,261  133  $5,721  294  14  $131,477  1,555  147  
Debt and Equity Securities, Realized Gain (Loss)  
Schedule of Realized Gain (Loss) [Table Text Block]
The Company uses the specific identification method of the individual security to determine the cost basis used in the calculation of realized gains and losses related to security sales.  

Three Months EndedSix Months Ended
Fixed Maturity Securities, Available-for-SaleJune 30,June 30,
(In thousands)2020201920202019
Proceeds$5,363  2,755  6,303  10,414  
Gross realized gains$123  107  123  109  
Gross realized losses$19  182  57  365  
Schedule of Maturities by Contractual Maturity Date [Abstract]  
Investments Classified by Contractual Maturity Date [Table Text Block] The amortized cost and fair value of fixed maturity securities at June 30, 2020 by contractual maturity are shown in the table below.  Actual maturities may differ from contractual maturities because borrowers may have the right to
call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date have been reflected based upon final stated maturity.

June 30, 2020Amortized
Cost		Fair
Value
(In thousands)
Fixed maturity securities:  
Due in one year or less$75,437  75,900  
Due after one year through five years104,138  110,410  
Due after five years through ten years224,482  243,865  
Due after ten years891,571  987,142  
Total fixed maturity securities$1,295,628  1,417,317