Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets
Fixed maturities, available for sale, at fair value (amortized cost: 2013-$12,119,833 ; 2012-$11,963,406)	$ 13,571,021	$ 13,541,193
Equity securities, at fair value (cost: 2013-$875 ; 2012-$14,875)	1,404	15,567
Policy loans	428,011	424,050
Other long-term investments	15,508	18,539
Short-term investments	176,250	94,860
Total investments	14,192,194	14,094,209
Cash	25,256	61,710
Accrued investment income	205,266	195,497
Other receivables	393,870	383,709
Deferred acquisition costs	3,229,000	3,198,431
Goodwill	441,591	441,591
Other assets	391,525	401,763
Total assets	18,878,702	18,776,910
Policy Liabilities:
Future policy benefits	10,839,599	10,706,219
Unearned and advance premiums	80,221	76,088
Policy claims and other benefits payable	226,946	228,470
Other policyholders' funds	93,902	93,288
Total policy liabilities	11,240,668	11,104,065
Current and deferred income taxes payable	1,603,569	1,609,828
Other liabilities	370,988	392,502
Short-term debt	368,903	319,043
Long-term debt (fair value: 2013 - $1,209,775 ; 2012 - $1,191,320)	989,976	989,686
Total liabilities	14,574,104	14,415,124
Shareholders' equity:
Preferred stock, par value $1 per share-Authorized 5,000,000 shares; outstanding: -0- in 2013 and in 2012	0	0
Common stock, par value $1 per share-Authorized 320,000,000 shares; outstanding: (2013-105,812,123 issued, less 12,928,772 held in treasury and 2012-105,812,123 issued, less 11,576,487 held in treasury)	105,812	105,812
Additional paid-in capital	450,243	439,782
Accumulated other comprehensive income (loss)	850,030	925,275
Retained earnings	3,498,727	3,403,338
Treasury stock, at cost	(600,214)	(512,421)
Total shareholders' equity	4,304,598	4,361,786
Total liabilities and shareholders' equity	$ 18,878,702	$ 18,776,910