Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Investments:
Fixed maturity securities	$ 11,635,178	$ 11,943,956
Equity securities	434,841	376,022
Arbitrage trading account	680,713	329,077
Investment funds	858,394	809,689
Loans receivable	359,177	401,961
Real estate	589,936	606,735
Total investments	14,558,239	14,467,440
Cash and cash equivalents	658,839	905,670
Premiums and fees receivable	1,582,395	1,440,752
Due from reinsurers	1,477,381	1,450,348
Accrued investment income	126,122	127,230
Prepaid reinsurance premiums	382,570	316,309
Deferred policy acquisition costs	433,274	404,047
Real estate, furniture and equipment	291,831	267,227
Federal and foreign income taxes - current and deferred	67,666	0
Goodwill	112,741	87,865
Trading account receivables from brokers and clearing organizations	144,150	446,873
Other assets	376,334	242,135
Total assets	20,211,542	20,155,896
Liabilities:
Reserves for losses and loss expenses	9,921,072	9,751,086
Unearned premiums	2,721,228	2,474,847
Due to reinsurers	337,370	316,388
Trading account securities sold but not yet purchased	171,990	121,487
Federal and foreign income taxes - current and deferred	0	82,801
Other liabilities	758,627	959,080
Junior subordinated debentures	339,614	243,206
Senior notes and other debt	1,695,986	1,871,535
Total liabilities	15,945,887	15,820,430
Equity:
Preferred stock, par value $.10 per share: Authorized 5,000,000 shares; issued and outstanding - none	0	0
Common stock, Value issued $.20 per share:Authorized 500,000,000 shares, issued and outstanding, net of treasury shares, 135,308,430 and 136,017,732 shares	47,024	47,024
Additional paid-in capital	956,084	945,166
Retained earnings	5,024,565	4,817,807
Accumulated other comprehensive income	210,225	465,631
Treasury stock, at cost, 99,809,488 and 99,100,186 shares, respectively	(1,999,294)	(1,969,411)
Total stockholders’ equity	4,238,604	4,306,217
Noncontrolling interests	27,051	29,249
Total equity	4,265,655	4,335,466
Total liabilities and equity	$ 20,211,542	$ 20,155,896