Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total		Preferred Stock	Common stocks	Accumulated Other Comprehensive Income (Loss)		Retained Earnings	Noncontrolling Interest
Balance at beginning of period at Dec. 31, 2016	$ 1,183,555		$ 3,000	$ 152,975	$ 149,555		$ 877,969	$ 56
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	187,333						187,305	28
Other comprehensive income	87,202	[1]			87,202
Reclassification related to the Tax Act	0				48,226	[2]	(48,226)
Stock-based compensation	708			708
Purchase of common stock	(246)			(22)			(224)
Dividends on preferred stock	(150)						(150)
Dividends on common stock	(81,251)						(81,251)
Noncontrolling Interest, Period Increase (Decrease)	(26)							(26)
Balance at end of period at Dec. 31, 2017	1,377,125		3,000	153,661	284,983		935,423	58
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax | Accounting Standards Update 2016-01	0				(5,480)		5,480
Net income	93,822						93,793	29
Other comprehensive income	(188,185)	[1]			(188,185)
Stock-based compensation	499			499
Purchase of common stock	(15,907)			(1,436)			(14,471)
Dividends on preferred stock	(150)						(150)
Dividends on common stock	(82,978)						(82,978)
Noncontrolling Interest, Period Increase (Decrease)	33							33
Balance at end of period at Dec. 31, 2018	1,184,259		3,000	152,724	91,318		937,097	120
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax | Accounting Standards Update 2016-02	595				0		595
Net income	126,308						126,209	99
Other comprehensive income	263,446	[1]			263,446
Stock-based compensation	419			419
Purchase of common stock	(4,577)			(410)			(4,167)
Dividends on preferred stock	(150)						(150)
Dividends on common stock	(84,324)						(84,324)
Noncontrolling Interest, Period Increase (Decrease)	(60)							(60)
Balance at end of period at Dec. 31, 2019	$ 1,485,916		$ 3,000	$ 152,733	$ 354,764		$ 975,260	$ 159

[1] Other comprehensive income (loss) is recorded net of deferred income taxes and other adjustments for assumed changes in deferred acquisition costs, value of insurance in force acquired, unearned revenue reserve and policyholder liabilities.

[2] 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.