Consolidated Balance Sheet Consolidated Balance Sheet - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets [Abstract]
Fixed maturity securities	$ 12,745,436	$ 12,444,394
Loans receivable	141,699	150,866
Equity securities	384,519	376,697
Investment funds	1,179,310	1,170,040
Loans receivable	149,388	273,103
Real estate	986,810	936,367
Total investments	15,587,162	15,351,467
Cash and cash equivalents	837,515	763,631
Premiums and fees receivable	1,749,273	1,669,186
Due from reinsurers	1,558,749	1,532,829
Prepaid reinsurance premiums	429,058	394,387
Trading account receivables from brokers and clearing organizations	373,833	383,115
Deferred policy acquisition costs	547,519	513,128
Property, furniture and equipment	346,471	348,224
Federal and foreign income taxes	0	48,952
Goodwill	153,747	153,291
Accrued investment income	130,380	123,164
Other assets	517,227	442,782
Total assets	22,230,934	21,724,156
Liabilities:
Reserves for losses and loss expenses	10,788,342	10,669,150
Unearned premiums	3,314,676	3,137,133
Due to reinsurers	256,838	224,752
Trading account securities sold but not yet purchased	35,956	37,035
Deferred Tax Liabilities, Net, Current	31,291	0
Other liabilities	754,292	837,937
Subordinated debentures	446,485	340,320
Senior notes and other debt	1,814,998	1,844,621
Total liabilities	$ 17,442,878	$ 17,090,948
Equity:
Authorized 5,000,000 shares; issued and outstanding - none
Authorized 500,000,000 shares, issued and outstanding, net of treasury shares, 122,599,552 and 123,307,837 shares, respectively	$ 47,024	$ 47,024
Additional paid-in capital	1,013,572	1,005,455
Retained earnings	6,282,870	6,178,070
Accumulated other comprehensive income (loss)	8,124	(66,698)
Treasury stock, at cost, 112,518,366 and 111,810,081 shares, respectively	2,600,377	2,563,605
Total stockholders’ equity	4,751,213	4,600,246
Noncontrolling interests	36,843	32,962
Total equity	4,788,056	4,633,208
Total liabilities and equity	$ 22,230,934	$ 21,724,156