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	$ 868,139	$ 857,948	$ 1,728,725	$ 1,710,743
Reinsurance ceded	(342,898)	(336,605)	(658,974)	(646,932)
Net of reinsurance ceded	525,241	521,343	1,069,751	1,063,811
Net investment income	507,771	488,460	1,014,184	963,577
Realized investment gains (losses):
Derivative financial instruments	(108,188)	(83,366)	(178,066)	(156,865)
All other investments	53,717	88,783	76,558	170,511
Other-than-temporary impairment losses	(33)	(5,527)	(2,758)	(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)	(10,616)	(3,584)
Other income	111,311	102,148	220,553	205,864
Total revenues	1,087,067	1,116,401	2,192,364	2,243,314
Benefits and expenses
Benefits and settlement expenses, net of reinsurance ceded: (three and six months 2017 -$286,234 and $549,611; three and six months 2016 - $276,294 and $576,167)	712,361	713,697	1,462,003	1,428,242
Amortization of deferred policy acquisition costs and value of business acquired	23,102	20,761	43,621	51,507
Other operating expenses, net of reinsurance ceded: (three and six months 2017 -$53,305 and $104,322; 2016 -$50,950 and $99,261)	225,836	213,282	448,623	423,062
Total benefits and expenses	961,299	947,740	1,954,247	1,902,811
Income before income tax	125,768	168,661	238,117	340,503
Income tax expense	41,500	56,541	78,435	113,035
Net income	$ 84,268	$ 112,120	$ 159,682	$ 227,468