CONSOLIDATED CONDENSED STATEMENTS OF INCOME (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues
Premiums and policy fees	$ 851,802	$ 756,331	$ 1,667,698	$ 1,483,178
Reinsurance ceded	(342,968)	(390,490)	(670,681)	(725,840)
Net of reinsurance ceded	508,834	365,841	997,017	757,338
Net investment income	550,816	466,220	1,088,979	923,854
Realized investment gains (losses):
Derivative financial instruments	(89,926)	143,881	(195,276)	151,266
All other investments	80,148	(109,978)	152,262	(114,123)
Other-than-temporary impairment losses	(461)	(1,789)	(884)	(3,129)
Portion recognized in other comprehensive income (before taxes)	(999)	(2,211)	(2,167)	(5,455)
Net impairment losses recognized in earnings	(1,460)	(4,000)	(3,051)	(8,584)
Other income	106,931	94,392	205,970	179,419
Total revenues	1,155,343	956,356	2,245,901	1,889,170
Benefits and expenses
Benefits and settlement expenses, net of reinsurance ceded: (three months: 2014 - $328,555; 2013 - $370,752; six months: 2014 - $633,387; 2013 - $678,058)	747,816	557,866	1,476,335	1,139,746
Amortization of deferred policy acquisition costs and value of business acquired	51,531	74,946	107,113	127,185
Other operating expenses, net of reinsurance ceded: (three months: 2014 - $46,545; 2013 - $50,406; six months: 2014 - $90,311; 2013 - $91,395)	193,786	166,531	375,038	347,599
Total benefits and expenses	993,133	799,343	1,958,486	1,614,530
Income before income tax	162,210	157,013	287,415	274,640
Income tax expense	54,233	53,814	95,799	93,150
Net income	$ 107,977	$ 103,199	$ 191,616	$ 181,490
Net income - basic (in dollars per share)	$ 1.35	$ 1.30	$ 2.40	$ 2.29
Net income - diluted (in dollars per share)	$ 1.33	$ 1.27	$ 2.36	$ 2.24
Cash dividends paid per share (in dollars per share)	$ 0.24	$ 0.20	$ 0.44	$ 0.38
Average shares outstanding - basic (in shares)	79,979,153	79,404,770	79,794,831	79,272,814
Average shares outstanding - diluted (in shares)	81,446,277	81,087,238	81,160,800	80,898,042