Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets
Insurance reserves	$ 1,646,137	$ 1,629,234
Other	1,442	821
Deferred tax assets	1,647,579	1,630,055
Deferred tax liabilities
Deferred policy acquisition costs	1,392,279	1,407,473
Deferred sales inducements	239,695	292,877
Net unrealized gains on securities	23,991	118,745
Investments	69,163	70,517
Deferred tax liabilities	1,725,128	1,889,612
Deferred tax liabilities	$ (77,549)	$ (259,557)