Summary of Investments (Unrealized Appreciation) (Details) - Continuing and Discontinuing Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Gain (Loss) on Securities [Line Items]
Available-for-sale fixed maturities	$ 33,264	$ (59,126)
Deferred policy acquisition costs	0	7,274
Income tax effect	(6,985)	10,890
Net unrealized investment depreciation of discontinued operations, sold	0	6,714
Cumulative change in accounting principles	0	(191,244)
Total change in net unrealized investment appreciation, net of tax	$ 26,279	$ (225,492)