CONSOLIDATED CONDENSED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues
Premiums and policy fees	$ 935,928	$ 862,906	$ 1,819,341	$ 1,718,485
Reinsurance ceded	(391,864)	(344,208)	(737,488)	(663,263)
Net of reinsurance ceded	544,064	518,698	1,081,853	1,055,222
Net investment income	578,414	475,722	1,067,832	950,431
Realized investment gains (losses):
Derivative financial instruments	17,060	(63,794)	63,886	(124,694)
All other investments	(49,643)	53,535	(137,194)	76,376
Other-than-temporary impairment losses	(10)	(33)	(701)	(128)
Portion recognized in other comprehensive income (before taxes)	5	(2,752)	(2,949)	(7,858)
Net impairment losses recognized in earnings	(5)	(2,785)	(3,650)	(7,986)
Other income	79,754	82,087	160,428	161,470
Total revenues	1,169,644	1,063,463	2,233,155	2,110,819
Benefits and expenses
Benefits and settlement expenses, net of reinsurance ceded: (three months: 2018 - $295,777; 2017 - $284,405; six months: 2018 - $641,603; 2017 - $545,805)	860,860	711,644	1,647,209	1,461,094
Amortization of deferred policy acquisition costs and value of business acquired	52,630	23,454	110,703	44,238
Other operating expenses, net of reinsurance ceded: (three months: 2018 - $52,558; 2017 - $54,132; six months: 2018 - $96,627; 2017 - $105,893)	195,260	195,079	392,413	385,557
Total benefits and expenses	1,108,750	930,177	2,150,325	1,890,889
Income before income tax	60,894	133,286	82,830	219,930
Income tax expense	8,626	43,654	12,287	71,959
Net income	$ 52,268	$ 89,632	$ 70,543	$ 147,971