Investments (Table Text Block)

12 Months Ended

Mar. 31, 2018

Mar. 31, 2017

Investments, Debt and Equity Securities [Abstract]

Available-for-Sale Investments

Available-for-sale investments at March 31, 2018 were as follows:

		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses More than 12 Months		Gross Unrealized Losses Less than 12 Months		Estimated Market Value
		(In thousands)
U.S. treasury securities and government obligations	$	123,557	$	3,595	$	(1,036)	$	(203)	$	125,913
U.S. government agency mortgage-backed securities		36,416		951		(1)		(93)		37,273
Obligations of states and political subdivisions		178,702		9,938		(217)		(18)		188,405
Corporate securities		1,388,300		50,056		(3,009)		(1,826)		1,433,521
Mortgage-backed securities		94,106		2,072		–		(153)		96,025
Redeemable preferred stocks		10,609		321		(29)		(40)		10,861
Common stocks		15,732		12,329		(10)		(189)		27,862
	$	1,847,422	$	79,262	$	(4,302)	$	(2,522)	$	1,919,860

Available-for-sale investments at March 31, 2017 were as follows:

		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses More than 12 Months		Gross Unrealized Losses Less than 12 Months		Estimated Market Value
		(In thousands)
U.S. treasury securities and government obligations	$	123,474	$	2,892	$	–	$	(1,675)	$	124,691
U.S. government agency mortgage-backed securities		27,908		1,070		(6)		(377)		28,595
Obligations of states and political subdivisions		159,417		9,466		(23)		(424)		168,436
Corporate securities		1,263,703		32,901		(5,731)		(13,837)		1,277,036
Mortgage-backed securities		26,577		515		–		(5)		27,087
Redeemable preferred stocks		13,789		168		–		(468)		13,489
Common stocks		15,732		8,728		(10)		(16)		24,434
	$	1,630,600	$	55,740	$	(5,770)	$	(16,802)	$	1,663,768

Adjusted Cost and Estimated Market Value of Available-for-sale Investments

		March 31, 2018				March 31, 2017
		Amortized Cost		Estimated Market Value		Amortized Cost		Estimated Market Value
		(In thousands)
Due in one year or less	$	36,446	$	36,674	$	35,399	$	35,795
Due after one year through five years		441,223		450,816		324,286		333,016
Due after five years through ten years		607,895		626,174		598,232		607,184
Due after ten years		641,411		671,448		616,585		622,763
		1,726,975		1,785,112		1,574,502		1,598,758
Mortgage backed securities		94,106		96,025		26,577		27,087
Redeemable preferred stocks		10,609		10,861		13,789		13,489
Equity securities		15,732		27,862		15,732		24,434
	$	1,847,422	$	1,919,860	$	1,630,600	$	1,663,768

Carrying Value of Other Investments

The carrying value of other investments was as follows:

		March 31,
		2018		2017
		(In thousands)
Mortgage loans, net	$	309,952	$	262,875
Short-term investments		10,350		15,149
Real estate		53,776		66,174
Policy loans		17,677		17,112
Other equity investments		7,309		6,520
	$	399,064	$	367,830