CONSOLIDATED CONDENSED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues
Premiums and policy fees	$ 878,182	$ 855,088	$ 2,709,216	$ 2,583,813
Reinsurance ceded	(269,335)	(325,120)	(1,005,699)	(984,094)
Net of reinsurance ceded	608,847	529,968	1,703,517	1,599,719
Net investment income	672,139	507,914	1,809,464	1,522,098
Realized investment gains (losses):
Derivative financial instruments	(27,465)	(82,341)	62,859	(260,407)
All other investments	(19,869)	18,150	(157,070)	94,708
Other-than-temporary impairment losses	(14)	(366)	(715)	(3,124)
Portion recognized in other comprehensive income (before taxes)	0	93	(2,949)	(7,765)
Net impairment losses recognized in earnings	(14)	(273)	(3,664)	(10,889)
Other income	113,530	110,970	341,802	331,523
Total revenues	1,347,168	1,084,388	3,756,908	3,276,752
Benefits and expenses
Benefits and settlement expenses, net of reinsurance ceded: (three and nine months 2018 - $215,848 and $861,501; three and nine months 2017 - $256,703 and $806,314)	952,353	743,934	2,600,703	2,205,937
Amortization of deferred policy acquisition costs and value of business acquired	33,511	3,991	144,009	47,612
Other operating expenses, net of reinsurance ceded: (three and nine months 2018 - $54,439 and $149,115; three and nine months 2017 - $57,293 and $161,615)	224,585	225,613	684,907	674,236
Total benefits and expenses	1,210,449	973,538	3,429,619	2,927,785
Income before income tax	136,719	110,850	327,289	348,967
Income tax expense	26,619	28,308	61,582	106,743
Net income	$ 110,100	$ 82,542	$ 265,707	$ 242,224