Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Insurance reserves	$ 245,488	$ 171,504
Deferred Tax Assets, Investments	8,283	0
Other	1,897	0
Deferred tax assets	255,668	171,504
Deferred tax liabilities:
Deferred policy acquisition costs	55,030	39,501
Net unrealized gains on securities	0	61,294
Investments	95,294	100,269
Other	0	7,944
Deferred tax liabilities	150,324	209,008
Net deferred tax asset (liability)	$ 105,344
Net deferred tax asset (liability)		$ 37,504