Consolidated Balance Sheet Consolidated Balance Sheet - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Assets [Abstract]
Fixed maturity securities	$ 12,395,810	$ 12,705,160
Loans receivable	153,513	170,991
Equity securities	830,212	450,648
Investment funds	1,123,829	1,211,401
Loans receivable	259,411	322,012
Real estate	820,257	731,612
Total investments	15,583,032	15,591,824
Cash and cash equivalents	756,368	674,441
Premiums and fees receivable	1,766,654	1,651,088
Due from reinsurers	1,533,267	1,503,441
Prepaid reinsurance premiums	415,672	395,748
Trading account receivables from brokers and clearing organizations	41,576	371,034
Deferred policy acquisition costs	521,312	488,525
Property, furniture and equipment	332,015	332,098
Federal and foreign income taxes	29,135	30,171
Goodwill	150,682	150,944
Accrued investment income	129,364	120,367
Other assets	430,732	369,558
Total assets	21,689,809	21,679,239
Liabilities:
Reserves for losses and loss expenses	10,622,374	10,369,701
Unearned premiums	3,190,144	3,026,732
Due to reinsurers	225,213	237,270
Trading account securities sold but not yet purchased	155,484	106,079
Other liabilities	776,207	859,736
Subordinated debentures	340,190	340,060
Senior notes and other debt	1,843,865	2,115,527
Total liabilities	$ 17,153,477	$ 17,055,105
Equity:
Authorized 5,000,000 shares; issued and outstanding - none
Authorized 500,000,000 shares, issued and outstanding, net of treasury shares, 122,481,580 and 126,748,836 shares, respectively	$ 47,024	$ 47,024
Additional paid-in capital	1,003,567	991,512
Retained earnings	5,945,305	5,732,410
Accumulated other comprehensive income	86,055	183,550
Treasury stock, at cost, 112,636,338 and 108,369,082 shares, respectively	2,579,764	2,364,551
Total stockholders’ equity	4,502,187	4,589,945
Noncontrolling interests	34,145	34,189
Total equity	4,536,332	4,624,134
Total liabilities and equity	$ 21,689,809	$ 21,679,239