CONSOLIDATED CONDENSED STATEMENTS OF INCOME (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues
Premiums and policy fees	$ 815,896	$ 726,847
Reinsurance ceded	(327,713)	(335,350)
Net of reinsurance ceded	488,183	391,497
Net investment income	538,163	457,634
Realized investment gains (losses):
Derivative financial instruments	(105,350)	7,385
All other investments	72,114	(4,145)
Other-than-temporary impairment losses	(423)	(1,340)
Portion recognized in other comprehensive income (before taxes)	(1,168)	(3,244)
Net impairment losses recognized in earnings	(1,591)	(4,584)
Other income	99,039	85,027
Total revenues	1,090,558	932,814
Benefits and expenses
Benefits and settlement expenses, net of reinsurance ceded: (2014 - $304,832; 2013 - $308,800)	728,519	581,880
Amortization of deferred policy acquisition costs and value of business acquired	55,582	52,239
Other operating expenses, net of reinsurance ceded: (2014 - $43,766; 2013 - $40,989)	181,252	181,068
Total benefits and expenses	965,353	815,187
Income before income tax	125,205	117,627
Income tax expense	41,566	39,336
Net income	$ 83,639	$ 78,291
Net income - basic (in dollars per share)	$ 1.05	$ 0.99
Net income - diluted (in dollars per share)	$ 1.03	$ 0.97
Cash dividends paid per share (in dollars per share)	$ 0.20	$ 0.18
Average shares outstanding - basic (in shares)	79,608,461	79,139,392
Average shares outstanding - diluted (in shares)	80,872,152	80,706,744