CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
CONSOLIDATED CONDENSED BALANCE SHEETS
Fixed maturities, amortized cost	$ 33,955,913	$ 33,662,295
Fixed maturities at amortized cost, fair value	420,747	335,676
Equity securities, cost	718,387	675,758
Mortgage loans, related to securitizations	582,177	627,731
Investment real estate, accumulated depreciation	1,129	1,066
Accounts and premiums receivable, allowance for uncollectible amounts	4,307	4,283
Property and equipment, accumulated depreciation	113,404	111,579
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)	9,931,123	10,199,514
Net unrealized gains (losses) on investments, income tax	547,474	289,908
Net unrealized (losses) gains relating to other-than-temporary impaired investments for which a portion has been recognized in earnings, income tax	2,754	325
Accumulated loss - derivatives, income tax	(115)	(666)
Postretirement benefits liability adjustment, income tax	$ (24,164)	$ (23,532)