Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Assets
Fixed maturities, available for sale, at fair value (amortized cost: 2013-$12,210,939 ; 2012-$11,963,406)	$ 12,862,567	$ 13,541,193	[1]
Equity securities, at fair value (cost: 2013-$875 ; 2012-$14,875)	1,587	15,567	[1]
Policy loans	433,331	424,050	[1]
Other long-term investments	15,311	18,539	[1]
Short-term investments	103,012	94,860	[1]
Total investments	13,415,808	14,094,209	[1]
Cash	44,937	61,710	[1]
Accrued investment income	196,521	195,497	[1]
Other receivables	388,745	383,709	[1]
Deferred acquisition costs	3,262,943	3,198,431	[1]
Goodwill	441,591	441,591	[1]
Other assets	390,728	401,763	[1]
Total assets	18,141,273	18,776,910	[1]
Liabilities:
Future policy benefits	10,967,788	10,706,219	[1]
Unearned and advance premiums	79,333	76,088	[1]
Policy claims and other benefits payable	228,545	228,470	[1]
Other policyholders' funds	94,269	93,288	[1]
Total policy liabilities	11,369,935	11,104,065	[1]
Current and deferred income taxes payable	1,300,023	1,609,828	[1]
Other liabilities	309,849	392,502	[1]
Short-term debt	348,910	319,043	[1]
Long-term debt (fair value: 2013-$1,156,108 ; 2012-$1,191,320)	990,270	989,686	[1]
Total liabilities	14,318,987	14,415,124	[1]
Shareholders' equity:
Preferred stock, par value $1 per share-Authorized 5,000,000 shares; outstanding: -0- in 2012 and in 2011	0	0	[1]
Common stock, par value $1 per share-Authorized 320,000,000 shares; outstanding: (2013-105,812,123 issued, less 14,218,532 held in treasury and 2012-105,812,123 issued, less 11,576,487 held in treasury)	105,812	105,812	[1]
Additional paid-in capital	460,235	439,782	[1]
Accumulated other comprehensive income (loss)	333,900	925,275	[1]
Retained earnings	3,613,315	3,403,338	[1]
Treasury stock, at cost	(690,976)	(512,421)	[1]
Total shareholders' equity	3,822,286	4,361,786	[1]
Total liabilities and shareholders' equity	$ 18,141,273	$ 18,776,910	[1]

[1] Derived from audited financial statements