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Investments (Tables)
 3 Months Ended
Mar. 31, 2021
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 90.8% of total cash and invested assets at March 31, 2021, as shown below.

Carrying Value
(In thousands, except for %)
March 31, 2021December 31, 2020
Amount%Amount%
Cash and invested assets:
Fixed maturity securities$1,420,587 90.8 %1,489,383 89.8 %
Equity securities22,366 1.4 %22,102 1.3 %
Policy loans82,674 5.3 %83,318 5.0 %
Real estate and other long-term investments19,918 1.3 %29,865 1.8 %
Cash and cash equivalents19,493 1.2 %34,131 2.1 %
Total cash and invested assets$1,565,038 100.0 %1,658,799 100.0 %
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 maturity securities as of the dates indicated.
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
March 31, 2021
(In thousands)
Fixed maturity securities:    
Available-for-sale:    
U.S. Treasury securities$9,508 1,513 — 11,021 
U.S. Government-sponsored enterprises3,483 1,034 — 4,517 
States and political subdivisions370,995 24,819 1,955 393,859 
Corporate:
Financial207,547 15,269 1,621 221,195 
Consumer204,988 16,745 3,034 218,699 
Energy79,422 4,904 1,092 83,234 
All Other294,528 21,395 4,261 311,662 
Residential mortgage-backed118,186 14,006 46 132,146 
Asset-backed43,874 327 63 44,138 
Foreign governments101 15 — 116 
Total fixed maturity securities$1,332,632 100,027 12,072 1,420,587 
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
December 31, 2020
(In thousands)
Fixed maturity securities:    
Available-for-sale:    
U.S. Treasury securities$9,529 1,797 — 11,326 
U.S. Government-sponsored enterprises3,490 1,301 — 4,791 
States and political subdivisions377,462 32,751 548 409,665 
Corporate:
Financial204,160 31,000 13 235,147 
Consumer196,648 30,116 245 226,519 
Energy81,223 8,174 536 88,861 
All Other284,209 42,554 82 326,681 
Commercial mortgage-backed225 — 4 221 
Residential mortgage-backed118,144 21,819 — 139,963 
Asset-backed46,295 278 482 46,091 
Foreign governments102 16 — 118 
Total fixed maturity securities$1,321,487 169,806 1,910 1,489,383 
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)
March 31, 2021December 31, 2020
Equity securities: 
Stock mutual funds$3,386 3,174 
Bond mutual funds12,452 12,354 
Common stock1,190 1,143 
Non-redeemable preferred stock276 281 
Non-redeemable preferred stock fund5,062 5,150 
Total equity securities$22,366 22,102 
Unrealized Continuous Losses on Investments [Abstract]  
Schedule of Unrealized Loss on Investments [Table Text Block]
The following tables present 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 March 31, 2021 and December 31, 2020.

March 31, 2021Less 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$49,464 1,955 48 $— — — $49,464 1,955 48 
Corporate:
Financial35,670 1,621 40 — — — 35,670 1,621 40 
Consumer51,477 3,034 49 — — — 51,477 3,034 49 
Energy14,151 593 14 2,557 499 6 16,708 1,092 20 
All Other74,922 4,261 96 — — — 74,922 4,261 96 
Residential mortgage-backed1,595 46 9 — — — 1,595 46 9 
Asset-backed6,434 48 11 9,253 15 8 15,687 63 19 
Total fixed maturity securities$233,713 11,558 267 $11,810 514 14 $245,523 12,072 281 

December 31, 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$32,487 548 27 $— — — $32,487 548 27 
Corporate:
Financial1,308 13 1 — — — 1,308 13 1 
Consumer10,740 230 5 1,667 15 1 12,407 245 6 
Energy6,350 536 8 — — — 6,350 536 8 
All Other9,418 82 11 — — — 9,418 82 11 
Commercial mortgage-backed221 4 1 — — — 221 4 1 
Residential mortgage-backed83 — 1 — — — 83 — 1 
Asset-backed26,353 481 26 994 1 1 27,347 482 27 
Total fixed maturity securities$86,960 1,894 80 $2,661 16 2 $89,621 1,910 82 
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 Ended
Fixed Maturity Securities, Available-for-SaleMarch 31,
(In thousands)20212020
Proceeds$7,254 940 
Gross realized gains$100 — 
Gross realized losses$1 38 
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 March 31, 2021 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.

March 31, 2021Amortized
Cost		Fair
Value
(In thousands)
Fixed maturity securities:  
Due in one year or less$25,079 25,438 
Due after one year through five years114,900 125,058 
Due after five years through ten years214,052 231,241 
Due after ten years978,601 1,038,850 
Total fixed maturity securities$1,332,632 1,420,587