Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Deferred tax assets, future policy benefit reserves and unpaid policy claims	$ 218,461	$ 206,794
Deferred tax assets, goodwill and intangible assets	17,115	19,436
Deferred tax assets, future deductible liabilities	13,372	10,235
Deferred tax assets, state income taxes	12,755	12,521
Deferred tax assets, foreign tax credits	46,455	40,386
Deferred tax assets, other	12,653	10,145
Total deferred tax assets before valuation allowance	320,811	299,517
Valuation allowance on foreign tax credits	(46,455)	(40,386)
Total deferred tax assets after valuation allowance	274,356	259,131
Deferred tax liabilities:
Deferred tax liabilities, deferred policy acquisition costs	(293,729)	(275,388)
Transitional amount for future policy benefit reserves prescribed in the Tax Reform Act	(17,798)	(22,307)
Deferred tax liabilities, unremitted earnings on foreign subsidiaries	(4,669)	(2,614)
Deferred tax liabilities, reinsurance deposit asset	(48,085)	(45,641)
Deferred tax liabilities, other	(15,144)	(17,139)
Total deferred tax liabilities	(379,425)	(363,089)
Net deferred tax liabilities	$ (105,069)	$ (103,958)