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Investments (Tables)
 9 Months Ended
Sep. 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 89.5% of total cash and invested assets at September 30, 2020, as shown below.

Carrying Value
(In thousands, except for %)
September 30, 2020December 31, 2019
Amount%Amount%
Cash and invested assets:
Fixed maturity securities$1,444,579 89.5 %$1,377,959 90.2 %
Equity securities21,151 1.3 %16,033 1.1 %
Policy loans83,962 5.2 %82,005 5.4 %
Real estate and other long-term investments22,239 1.4 %2,956 0.2 %
Short-term investments— — %1,301 0.1 %
Cash and cash equivalents42,261 2.6 %46,205 3.0 %
Total cash and invested assets$1,614,192 100.0 %$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
September 30, 2020
(In thousands)
Fixed maturity securities:    
Available-for-sale:    
U.S. Treasury securities$9,549 1,960 — 11,509 
U.S. Government-sponsored enterprises3,497 1,358 — 4,855 
States and political subdivisions401,852 31,926 1,059 432,719 
Corporate:
Financial205,453 23,735 478 228,710 
Consumer176,020 21,911 1,414 196,517 
Energy81,326 4,525 2,191 83,660 
All Other265,948 33,708 618 299,038 
Commercial mortgage-backed225 — 4 221 
Residential mortgage-backed118,088 23,699 — 141,787 
Asset-backed45,996 189 741 45,444 
Foreign governments102 17 — 119 
Total fixed maturity securities$1,308,056 143,028 6,505 1,444,579 
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)
September 30, 2020December 31, 2019
Equity securities: 
Stock mutual funds$2,833 3,274 
Bond mutual funds11,935 12,311 
Common stock1,145 134 
Non-redeemable preferred stock267 314 
Non-redeemable preferred stock fund4,971 — 
Total equity securities$21,151 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 September 30, 2020.

September 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 maturity securities:        
Available-for-sale securities:         
States and political subdivisions$32,824 1,059 29 $— — — $32,824 1,059 29 
Corporate:
Financial16,146 478 14 — — — 16,146 478 14 
Consumer26,861 1,130 19 2,990 284 2 29,851 1,414 21 
Energy25,297 2,191 30 — — — 25,297 2,191 30 
All Other20,260 618 24 — — — 20,260 618 24 
Commercial mortgage-backed221 4 1 — — — 221 4 1 
Residential mortgage-backed85 — 1 — — — 85 — 1 
Asset-backed38,680 741 38 — — — 38,680 741 38 
Total fixed maturity securities$160,374 6,221 156 $2,990 284 2 $163,364 6,505 158 
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 maturity securities:        
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 maturity securities$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 EndedNine Months Ended
Fixed Maturity Securities, Available-for-SaleSeptember 30,September 30,
(In thousands)2020201920202019
Proceeds$11,221 29,294 17,524 39,708 
Gross realized gains$25 125 148 234 
Gross realized losses$77 22 134 387 
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 September 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.

September 30, 2020Amortized
Cost		Fair
Value
(In thousands)
Fixed maturity securities:  
Due in one year or less$47,918 48,263 
Due after one year through five years106,727 114,430 
Due after five years through ten years227,840 250,142 
Due after ten years925,571 1,031,744 
Total fixed maturity securities$1,308,056 1,444,579