Investments (Tables)

3 Months Ended

Mar. 31, 2018

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 89.7% of total cash, cash equivalents and investments at March 31, 2018. The Company's cash, cash equivalents and investments are listed below.

	March 31, 2018			December 31, 2017
	Carrying Value		% of Total Carrying Value	Carrying Value		% of Total Carrying Value
	(In thousands)			(In thousands)
Fixed maturity securities	$	1,211,800	89.7	$	1,208,570	89.3
Equity securities	15,449		1.1	16,164		1.2
Mortgage loans	193		—	195		—
Policy loans	75,636		5.6	73,735		5.5
Real estate and other long-term investments	7,369		0.5	7,452		0.6
Cash and cash equivalents	41,247		3.1	46,064		3.4
Total cash, cash equivalents and investments	$	1,351,694	100.0	$	1,352,180	100.0

Unrealized Gain (Loss) on Investments [Abstract]

Unrealized Gain (Loss) on Investments [Table Text Block]

The following tables represent the cost, gross unrealized gains and losses and fair value for fixed maturities as of the periods indicated.

	March 31, 2018
	Cost or Amortized Cost		Gross Unrealized Gains	Gross Unrealized Losses	Fair Value
	(In thousands)
Fixed maturities:
Available-for-sale:
U.S. Treasury securities	$	9,842	1,651	—	11,493
U.S. Government-sponsored enterprises	3,565		807	—	4,372
States and political subdivisions	558,513		13,977	2,810	569,680
Foreign governments	103		18	—	121
Corporate	386,664		12,069	5,019	393,714
Residential mortgage-backed	1,616		102	3	1,715
Total available-for-sale securities	960,303		28,624	7,832	981,095
Held-to-maturity securities:
States and political subdivisions	210,623		5,759	722	215,660
Corporate	20,082		680	595	20,167
Total held-to-maturity securities	230,705		6,439	1,317	235,827
Total fixed maturities	$	1,191,008	35,063	9,149	1,216,922

	December 31, 2017
	Cost or Amortized Cost		Gross Unrealized Gains	Gross Unrealized Losses	Fair Value
	(In thousands)
Fixed maturities:
Available-for-sale securities:
U.S. Treasury securities	$	9,860	1,948	—	11,808
U.S. Government-sponsored enterprises	3,570		926	—	4,496
States and political subdivisions	550,536		18,507	1,540	567,503
Foreign governments	103		18	—	121
Corporate	370,043		20,212	1,552	388,703
Residential mortgage-backed	1,865		118	5	1,978
Total available-for-sale securities	935,977		41,729	3,097	974,609
Held-to-maturity securities:
States and political subdivisions	213,054		7,585	629	220,010
Corporate	20,907		1,118	658	21,367
Total held-to-maturity securities	233,961		8,703	1,287	241,377
Total fixed maturity securities	$	1,169,938	50,432	4,384	1,215,986

Marketable Securities, Equity Securities [Abstract]

Schedule of Equity Securities [Table Text Block]

The majority of the Company's equity securities are diversified stock and bond mutual funds.

	March 31, 2018		December 31, 2017
	Fair Value		Fair Value
	(In thousands)
Equity securities:
Stock mutual funds	$	3,117	3,217
Bond mutual funds	12,167		12,367
Common stock	21		24
Preferred stock	144		556
Total equity securities	$	15,449	16,164

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 have remained in a continuous unrealized loss position for the periods indicated.

	March 31, 2018
	Less than 12 months				Greater than 12 months			Total
	Fair Value		Unrealized Losses	# of Securities	Fair Value	Unrealized Losses	# of Securities	Fair Value	Unrealized Losses	# of Securities
	(In thousands, except for # of securities)
Fixed maturities:
Available-for-sale securities:
States and political subdivisions	$	152,198	1,298	140	44,902	1,512	41	197,100	2,810	181
Corporate	170,388		4,160	115	7,340	859	7	177,728	5,019	122
Residential mortgage-backed	—		—	2	154	3	4	154	3	6
Total available-for-sale securities	322,586		5,458	257	52,396	2,374	52	374,982	7,832	309
Held-to-maturity securities:
States and political subdivisions	23,109		153	24	8,905	569	16	32,014	722	40
Corporate	—		—	—	2,225	595	2	2,225	595	2
Total held-to-maturity securities	23,109		153	24	11,130	1,164	18	34,239	1,317	42
Total fixed maturities	$	345,695	5,611	281	63,526	3,538	70	409,221	9,149	351

As of March 31, 2018, the Company had 52 available-for-sale fixed maturity securities and 18 held-to-maturity fixed maturity securities that were in an unrealized loss position for greater than 12 months.

	December 31, 2017
	Less than 12 months				Greater than 12 months			Total
	Fair Value		Unrealized Losses	# of Securities	Fair Value	Unrealized Losses	# of Securities	Fair Value	Unrealized Losses	# of Securities
	(In thousands, except for # of securities)
Fixed maturities:
Available-for-sale securities:
States and political subdivisions	$	49,408	312	46	47,233	1,228	46	96,641	1,540	92
Corporate	61,071		732	39	7,651	820	10	68,722	1,552	49
Residential mortgage-backed	132		3	4	157	2	4	289	5	8
Total available-for-sale securities	110,611		1,047	89	55,041	2,050	60	165,652	3,097	149
Held-to-maturity securities:
States and political subdivisions	14,178		45	15	7,460	584	14	21,638	629	29
Corporate	—		—	—	2,169	658	2	2,169	658	2
Total held-to-maturity securities	14,178		45	15	9,629	1,242	16	23,807	1,287	31
Total fixed maturities	$	124,789	1,092	104	64,670	3,292	76	189,459	4,384	180
Equity securities:
Common stock	95		6	1	—	—	—	95	6	1
Total equity securities	$	95	6	1	—	—	—	95	6	1

Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]

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.  

	Fixed Maturities, Available-for-Sale			Equity Securities
	Three Months Ended			Three Months Ended
	March 31,			March 31,
	2018		2017	2018	2017
	(In thousands)
Proceeds	$	—	508	—	1,940
Gross realized gains	$	—	6	—	—
Gross realized losses	$	—	—	—	30

Schedule of Fixed Maturities [Abstract]

Investments Classified by Contractual Maturity Date [Table Text Block]

The amortized cost and fair value of fixed maturity securities at March 31, 2018 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, 2018
	Amortized Cost		Fair Value
	(In thousands)
Available-for-sale securities:
Due in one year or less	$	40,387	40,592
Due after one year through five years	111,478		114,927
Due after five years through ten years	146,207		150,234
Due after ten years	662,231		675,342
Total available-for-sale securities	960,303		981,095
Held-to-maturity securities:
Due in one year or less	20,392		20,437
Due after one year through five years	43,646		44,545
Due after five years through ten years	49,116		49,935
Due after ten years	117,551		120,910
Total held-to-maturity securities	230,705		235,827
Total fixed maturities	$	1,191,008	1,216,922