CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues:
Net premiums	$ 2,346,945	$ 2,129,043	$ 4,503,950	$ 4,152,895
Investment income, net of related expenses	507,666	450,539	924,932	877,430
Investment related gains (losses), net:
Other-than-temporary impairments on fixed maturity securities	(846)	(4,137)	(34,663)	(6,664)
Other investment related gains (losses), net	119,110	(12,041)	32,041	(1,931)
Total investment related gains (losses), net	118,264	(16,178)	(2,622)	(8,595)
Other revenues	66,193	66,936	125,376	129,223
Total revenues	3,039,068	2,630,340	5,551,636	5,150,953
Benefits and Expenses:
Claims and other policy benefits	1,997,502	1,866,183	3,884,266	3,641,634
Interest credited	95,849	77,246	183,754	197,924
Policy acquisition costs and other insurance expenses	405,681	300,412	639,444	577,455
Other operating expenses	159,895	131,600	317,319	253,218
Interest expense	20,331	35,851	53,138	71,478
Collateral finance and securitization expense	6,587	5,258	12,912	11,329
Total benefits and expenses	2,685,845	2,416,550	5,090,833	4,753,038
Income before income taxes	353,223	213,790	460,803	397,915
Provision for income taxes	117,120	83,399	148,228	142,410
Net income	$ 236,103	$ 130,391	$ 312,575	$ 255,505
Earnings per share:
Basic earnings per share	$ 3.68	$ 1.97	$ 4.86	$ 3.80
Diluted earnings per share	3.64	1.94	4.81	3.76
Dividends declared per share	$ 0.37	$ 0.33	$ 0.74	$ 0.66