Consolidated Balance Sheet Consolidated Balance Sheet - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Assets [Abstract]
Fixed maturity securities	$ 12,368,319	$ 12,705,160
Loans receivable	177,877	170,991
Equity securities	351,179	450,648
Investment funds	1,140,218	1,211,401
Loans receivable	286,273	322,012
Real estate	873,909	731,612
Total investments	15,197,775	15,591,824
Cash and cash equivalents	879,934	674,441
Premiums and fees receivable	1,720,637	1,651,088
Due from reinsurers	1,559,277	1,503,441
Prepaid reinsurance premiums	400,392	395,748
Trading account receivables from brokers and clearing organizations	401,941	371,034
Deferred policy acquisition costs	524,269	488,525
Property, furniture and equipment	336,825	332,098
Federal and foreign income taxes	2,021	30,171
Goodwill	153,281	150,944
Accrued investment income	128,140	120,367
Other assets	434,074	369,558
Total assets	21,738,566	21,679,239
Liabilities:
Reserves for losses and loss expenses	10,661,054	10,369,701
Unearned premiums	3,198,009	3,026,732
Due to reinsurers	230,008	237,270
Trading account securities sold but not yet purchased	33,360	106,079
Other liabilities	820,278	859,736
Subordinated debentures	340,255	340,060
Senior notes and other debt	1,838,965	2,115,527
Total liabilities	$ 17,121,929	$ 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, 123,267,846 and 126,748,836 shares, respectively	$ 47,024	$ 47,024
Additional paid-in capital	989,547	991,512
Retained earnings	6,083,120	5,732,410
Accumulated other comprehensive income	28,111	183,550
Treasury stock, at cost, 111,850,072 and 108,369,082 shares, respectively	2,564,536	2,364,551
Total stockholders’ equity	4,583,266	4,589,945
Noncontrolling interests	33,371	34,189
Total equity	4,616,637	4,624,134
Total liabilities and equity	$ 21,738,566	$ 21,679,239