Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Stockholders' Equity Note [Abstract]

Dividends Declared [Table Text Block]

Dividends
	Year ended December 31,
	2019		2018		2017
Class A and B common stock:
Cash dividends per common share	$	1.92	$	1.84	$	1.76
Special cash dividend per common share	1.50		1.50		1.50
Total common stock dividends per share	$	3.42	$	3.34	$	3.26
Series B preferred stock cash dividends per share	$	0.03	$	0.03	$	0.03

Schedule of Stock by Class [Table Text Block]

Reconciliation of Outstanding Common Stock
	Class A					Class B (1)			Total
	Shares		Dollars			Shares	Dollars		Shares		Dollars
	(Dollars in thousands)
Outstanding at January 1, 2017	24,882,542		$	152,903		11,413	$	72	24,893,955		$	152,975
Stock-based compensation	40,082		708			—	—		40,082		708
Purchase of common stock	(3,511	)	(22		)	—	—		(3,511	)	(22		)
Outstanding at December 31, 2017	24,919,113		153,589			11,413	72		24,930,526		153,661
Issuance of common stock under compensation plans	21,126		499			—	—		21,126		499
Purchase of common stock	(232,837	)	(1,436		)	—	—		(232,837	)	(1,436		)
Outstanding at December 31, 2018	24,707,402		152,652			11,413	72		24,718,815		152,724
Stock-based compensation	11,875		419			—	—		11,875		419
Purchase of common stock	(66,475	)	(410		)	—	—		(66,475	)	(410		)
Outstanding at December 31, 2019	24,652,802		$	152,661		11,413	$	72	24,664,215		$	152,733

(1)

There is no established market for our Class B common stock, although it is convertible upon demand of the holder into Class A common stock on a share-for-share basis.

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

Accumulated Other Comprehensive Income, Net of Tax and Other Offsets
	Unrealized Net Investment Gains (Losses) (1)			Accumulated Non-Credit Impairment Gains (Losses)			Underfunded Portion of Certain Benefit Plans (2)			Total
	(Dollars in thousands)
Balance at January 1, 2017	$	156,963		$	311		$	(7,719	)	$	149,555
Other comprehensive income before reclassifications	88,534			136			—			88,670
Reclassification related to the Tax Act (3)	49,657			90			(1,521		)	48,226
Reclassification adjustments	15			—			(1,483		)	(1,468		)
Balance at December 31, 2017	295,169			537			(10,723		)	284,983
Cumulative effect of change in accounting principle related to net unrealized gains on equity securities (4)	(5,480		)	—			—			(5,480		)
Other comprehensive income before reclassifications	(191,158		)	2,654			—			(188,504		)
Reclassification adjustments	(1,610		)	(58		)	1,987			319
Balance at December 31, 2018	96,921			3,133			(8,736		)	91,318
Other comprehensive income before reclassifications	265,910			(1,159		)	—			264,751
Reclassification adjustments	189			—			(1,494		)	(1,305		)
Balance at December 31, 2019	$	363,020		$	1,974		$	(10,230	)	$	354,764

(1) Unrealized net investment gains (losses) relate to available-for-sale securities and include the impact of taxes, deferred acquisition costs, value of insurance in force acquired, unearned revenue reserves and policyholder liabilities. See Note 2 for further information.

(2) For descriptions of the underfunded portion of our postretirement benefit plans, see Note 8 - Other Retirement Plans, and for certain other defined benefit plans, see Note 8 - Defined Benefit Pension Plans.

(3) Reclassification of the initial impact of the remeasurement of deferred tax assets and liabilities upon enactment of the Tax Act. See discussion of this accounting change as discussed in Note 1.

(4) See Note 1 to our consolidated financial statements for further discussion on this one-time adjustment related to an accounting change.

Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]

Accumulated Other Comprehensive Income Reclassification Adjustments
	Year ended December 31, 2019
	Unrealized Net Investment Gains (Losses) (1)			Accumulated Non-Credit Impairment Losses (1)		Underfunded Portion of Certain Benefit Plans (2)			Total
	(Dollars in thousands)
Realized capital gains on sales of fixed maturities	$	(2	)	$	—	$	—		$	(2	)
Adjustments for assumed changes in deferred policy acquisition costs, value of insurance in force acquired, unearned revenue reserve and policyholder liabilities	241			—		—			241
Other expenses - change in unrecognized postretirement items:
Net actuarial gain	—			—		(1,892		)	(1,892		)
Reclassifications before income taxes	239			—		(1,892		)	(1,653		)
Income taxes	(50		)	—		398			348
Reclassification adjustments	$	189		$	—	$	(1,494	)	$	(1,305	)

	Year ended December 31, 2018
	Unrealized Net Investment Gains (Losses) (1)			Accumulated Non-Credit Impairment Losses (1)			Underfunded Portion of Certain Benefit Plans (2)			Total
	(Dollars in thousands)
Realized capital gains on sales of investments	$	(1,832	)	$	—		$	—		$	(1,832	)
Adjustments for assumed changes in deferred policy acquisition costs, value of insurance in force acquired, unearned revenue reserve and policyholder liabilities	(206		)	1			—			(205		)
Other than temporary impairment losses	—			(74		)	—			(74		)
Other expenses - change in unrecognized postretirement items:
Net actuarial loss	—			—			2,515			2,515
Reclassifications before income taxes	(2,038		)	(73		)	2,515			404
Income taxes	428			15			(528		)	(85		)
Reclassification adjustments	$	(1,610	)	$	(58	)	$	1,987		$	319

	Year ended December 31, 2017
	Unrealized Net Investment Gains (Losses) (1)			Accumulated Non-Credit Impairment Losses (1)		Underfunded Portion of Certain Benefit Plans (2)			Total
	(Dollars in thousands)
Realized capital gains on sales of investments	$	(255	)	$	—	$	—		$	(255	)
Adjustments for assumed changes in deferred policy acquisition costs, value of insurance in force acquired, unearned revenue reserve and policyholder liabilities	274			—		—			274
Other expenses - change in unrecognized postretirement items:
Net actuarial loss	—			—		(1,702		)	(1,702		)
Reclassifications before income taxes	19			—		(1,702		)	(1,683		)
Income taxes	(4		)	—		219			215
Reclassification adjustments	$	15		$	—	$	(1,483	)	$	(1,468	)

(1) See Note 2 for further information.

(2)

For descriptions of the underfunded portion of our postretirement benefit plans, see Note 8 - Other Retirement Plans, and for certain other defined benefit plans, see Note 8 - Defined Benefit Plans.