CONSOLIDATED CONDENSED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues
Premiums and policy fees	$ 855,088	$ 834,544	$ 2,583,813	$ 2,545,287
Reinsurance ceded	(325,120)	(322,229)	(984,094)	(969,161)
Net of reinsurance ceded	529,968	512,315	1,599,719	1,576,126
Net investment income	507,914	482,729	1,522,098	1,446,306
Realized investment gains (losses):
Derivative financial instruments	(82,341)	116	(260,407)	(156,749)
All other investments	18,150	24,152	94,708	194,663
Other-than-temporary impairment losses	(366)	(1,898)	(3,124)	(10,194)
Portion recognized in other comprehensive income (before taxes)	93	(1,410)	(7,765)	3,302
Net impairment losses recognized in earnings	(273)	(3,308)	(10,889)	(6,892)
Other income	110,970	107,642	331,523	313,506
Total revenues	1,084,388	1,123,646	3,276,752	3,366,960
Benefits and expenses
Benefits and settlement expenses, net of reinsurance ceded: (three months: 2017 - $256,703; 2016 - $279,109; nine months: 2017 - $806,314; 2016 - $855,276)	743,934	733,051	2,205,937	2,161,293
Amortization of deferred policy acquisition costs and value of business acquired	3,991	43,392	47,612	94,899
Other operating expenses, net of reinsurance ceded: (three months: 2017 - $57,293; 2016 - $49,073; nine months: 2017 - $161,615; 2016 - $148,334)	225,613	214,124	674,236	637,186
Total benefits and expenses	973,538	990,567	2,927,785	2,893,378
Income before income tax	110,850	133,079	348,967	473,582
Income tax expense	28,308	39,785	106,743	152,820
Net income	$ 82,542	$ 93,294	$ 242,224	$ 320,762