CONSOLIDATED CONDENSED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues
Premiums and policy fees	$ 862,906	$ 853,351	$ 1,718,485	$ 1,701,720
Reinsurance ceded	(344,208)	(340,594)	(663,263)	(655,468)
Net of reinsurance ceded	518,698	512,757	1,055,222	1,046,252
Net investment income	475,722	458,783	950,431	907,012
Realized investment gains (losses):
Derivative financial instruments	(63,794)	43,548	(124,694)	75,456
All other investments	53,535	88,783	76,376	170,492
Other-than-temporary impairment losses	(33)	(5,527)	(128)	(8,296)
Portion recognized in other comprehensive income (before taxes)	(2,752)	4,560	(7,858)	4,712
Net impairment losses recognized in earnings	(2,785)	(967)	(7,986)	(3,584)
Other income	82,087	71,938	161,470	139,116
Total revenues	1,063,463	1,174,842	2,110,819	2,334,744
Benefits and expenses
Benefits and settlement expenses, net of reinsurance ceded: (three months: 2017 - $284,405; 2016 - $274,911; six months: 2017 - $545,805; 2016 - $574,179)	711,644	712,647	1,461,094	1,425,668
Amortization of deferred policy acquisition costs and value of business acquired	23,454	21,064	44,238	52,105
Other operating expenses, net of reinsurance ceded: (three months: 2017 - $54,132; 2016 - $51,664; six months: 2017 - $105,893; 2016 - $100,890)	195,079	180,551	385,557	361,412
Total benefits and expenses	930,177	914,262	1,890,889	1,839,185
Income before income tax	133,286	260,580	219,930	495,559
Income tax expense	43,654	87,787	71,959	164,149
Net income	$ 89,632	$ 172,793	$ 147,971	$ 331,410