CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Net premiums	$ 2,582,551	$ 2,365,696
Investment income, net of related expenses	516,329	514,364
Investment related gains (losses), net:
Other-than-temporary impairments on fixed maturity securities	0	(17,189)
Other investment related gains (losses), net	(470)	77,712
Total investment related gains (losses), net	(470)	60,523
Other revenues	75,297	68,157
Total revenues	3,173,707	3,008,740
Benefits and Expenses:
Claims and other policy benefits	2,362,101	2,106,145
Interest credited	80,449	107,684
Policy acquisition costs and other insurance expenses	356,902	379,389
Other operating expenses	191,274	158,506
Interest expense	37,454	42,402
Collateral finance and securitization expense	7,602	6,770
Total benefits and expenses	3,035,782	2,800,896
Income before income taxes	137,925	207,844
Provision for income taxes	37,695	62,332
Net income	$ 100,230	$ 145,512
Earnings per share:
Basic earnings per share	$ 1.55	$ 2.26
Diluted earnings per share	1.52	2.22
Dividends declared per share	$ 0.50	$ 0.41