CONSOLIDATED BALANCE SHEETS (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Assets
Fixed maturities, available for sale, at fair value (Amortized cost 2011: $10,641,187; 2010: $10,346,243)	$ 10,736,729	$ 10,482,897
Equity securities, available for sale, at fair value (Cost 2011: $634,268; 2010: $327,207)	567,881	349,254
Other investments, at fair value	643,270	519,296
Short-term investments, at amortized cost	149,136	172,719
Total investments	12,097,016	11,524,166
Cash and cash equivalents	935,216	929,515
Restricted cash and cash equivalents	265,821	115,840
Accrued interest receivable	95,320	96,364
Insurance and reinsurance premium balances receivable	1,665,636	1,343,665
Reinsurance recoverable on unpaid and paid losses	1,759,017	1,577,547
Deferred acquisition costs	477,403	359,300
Prepaid reinsurance premiums	239,769	221,396
Receivable for investments sold	86,932	0
Goodwill and intangible assets	98,260	103,231
Other assets	223,540	174,707
Total assets	17,943,930	16,445,731
Liabilities
Reserve for losses and loss expenses	8,334,841	7,032,375
Unearned premiums	2,805,620	2,333,676
Insurance and reinsurance balances payable	179,081	164,927
Senior notes	994,523	994,110
Other liabilities	144,771	275,422
Payable for investments purchased	127,989	20,251
Total liabilities	12,586,825	10,820,761
Commitments and contingencies
Shareholders' equity
Preferred shares - Series A and B	500,000	500,000
Common shares (2011: 169,099; 2010: 154,912 shares issued and 2011: 126,141; 2010: 112,393 shares outstanding)	2,112	1,934
Additional paid-in capital	2,095,727	2,059,708
Accumulated other comprehensive income	50,932	176,821
Retained earnings	4,105,216	4,267,608
Treasury shares, at cost (2011: 42,958; 2010: 42,519 shares)	(1,396,882)	(1,381,101)
Total shareholders' equity	5,357,105	5,624,970
Total liabilities and shareholders' equity	$ 17,943,930	$ 16,445,731