Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Taxes [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

Income Tax Expenses (Credits)
	Year ended December 31,
	2016			2015			2014
	(Dollars in thousands)
Taxes provided in consolidated statements of operations on:
Income before equity loss:
Current	$	36,461		$	40,578		$	39,562
Deferred	9,549			6,840			7,773
	46,010			47,418			47,335
Equity loss, including low income housing tax credits	(15,498		)	(15,706		)	(13,372		)
Taxes provided in consolidated statements of changes in stockholders' equity:
Accumulated other comprehensive income	18,882			(77,473		)	75,032
Class A and Class B common stock	(846		)	(1,363		)	(1,148		)
	18,036			(78,836		)	73,884
	$	48,548		$	(47,124	)	$	107,847

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

Effective Tax Rate Reconciliation to Federal Income Tax Rate
	Year ended December 31,
	2016			2015			2014
	(Dollars in thousands)
Income before income taxes and equity loss	$	141,789		$	151,368		$	147,101
Income tax at federal statutory rate (35%)	$	49,626		$	52,979		$	51,485
Tax effect (decrease) of:
Tax-exempt dividend and interest income	(2,950		)	(3,233		)	(3,400		)
Other items	(666		)	(2,328		)	(750		)
Income tax expense	$	46,010		$	47,418		$	47,335

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

Tax Effect of Temporary Differences Giving Rise to Deferred Income Tax Assets and Liabilities
	December 31,
	2016		2015
	(Dollars in thousands)
Deferred income tax assets:
Future policy benefits	$	30,340	$	25,918
Accrued benefit and compensation costs	10,001		15,138
Loss carryforwards	5,709		8,212
Other	2,393		4,030
	48,443		53,298
Deferred income tax liabilities:
Fixed maturity and equity securities	131,655		94,919
Deferred acquisition costs	62,599		65,310
Value of insurance in force acquired	3,229		7,320
Property and equipment	7,777		7,078
Other	6,678		13,734
	211,938		188,361
Net deferred income tax liability	$	163,495	$	135,063