CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
CONSOLIDATED CONDENSED BALANCE SHEETS
Fixed maturities, amortized cost	$ 27,383,749	$ 26,681,324
Fixed maturities at amortized cost, fair value	333,771	319,163
Equity securities, cost	451,189	409,376
Mortgage loans, related to securitizations	699,267	765,520
Investment real estate, accumulated depreciation	1,161	1,017
Accounts and premiums receivable, allowance for uncollectible amounts	4,491	4,290
Property and equipment, accumulated depreciation	109,194	105,789
Preferred Stock, par value (in dollars per share)	$ 1	$ 1
Preferred Stock, shares authorized (in shares)	4,000,000	4,000,000
Preferred Stock, shares Issued (in shares)	0	0
Common Stock, par value (in dollars per share)	$ 0.50	$ 0.50
Common Stock, shares authorized (in shares)	160,000,000	160,000,000
Common Stock, shares issued (in shares)	88,776,960	88,776,960
Treasury stock, shares (in shares)	10,311,907	10,639,467
Net unrealized gains (losses) on investments, income tax	473,513	978,656
Net unrealized (losses) gains relating to other-than-temporary impaired investments for which a portion has been recognized in earnings, income tax	779	(2,147)
Accumulated loss - derivatives, income tax	(1,569)	(1,883)
Postretirement benefits liability adjustment, income tax	$ (41,312)	$ (39,468)