Unaudited Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
ASSETS:
Fixed maturity investments trading, at fair value (amortized cost: 2013: $6,264,343; 2012: $6,473,429)	$ 6,285,778	$ 6,626,454
Equity securities trading, at fair value (cost: 2013: $594,025; 2012: $480,312)	640,925	523,949
Other invested assets	849,100	783,534
Total investments	7,775,803	7,933,937
Cash and cash equivalents	674,103	681,879
Restricted cash	194,046	183,485
Insurance balances receivable	814,620	510,532
Funds held	387,599	336,368
Prepaid reinsurance	339,936	277,406
Reinsurance recoverable	1,179,525	1,141,110
Accrued investment income	24,112	29,135
Net deferred acquisition costs	153,812	108,010
Goodwill	268,376	268,376
Intangible assets	50,098	51,365
Balances receivable on sale of investments	277,025	418,879
Net deferred tax assets	40,550	25,580
Other assets	85,272	63,884
Total assets	12,264,877	12,029,946
LIABILITIES:
Reserve for losses and loss expenses	5,696,865	5,645,549
Unearned premiums	1,586,327	1,218,021
Reinsurance balances payable	205,884	136,264
Balances due on purchases of investments	487,063	759,934
Senior notes	798,355	798,215
Dividends payable	17,127	0
Accounts payable and accrued liabilities	100,027	145,628
Total liabilities	8,891,648	8,703,611
Commitments and contingencies
SHAREHOLDERS' EQUITY:
Common shares, 2013: par value CHF 12.30 per share and 2012: par value CHF 12.64 per share, (2013: 35,429,423; 2012: 36,369,868 shares issued and 2013: 34,175,831; 2012: 34,797,781 shares outstanding)	430,397	454,980
Treasury shares, at cost (2013: 1,253,592; 2012: 1,572,087)	(91,661)	(113,818)
Retained earnings	3,034,493	2,985,173
Total shareholders' equity	3,373,229	3,326,335
Total liabilities and shareholders' equity	$ 12,264,877	$ 12,029,946