Reserve For Losses And Loss Expenses (Tables)

12 Months Ended

Dec. 31, 2012

Reserve For Losses And Loss Expenses [Abstract]

Components of liabilty for unpaid losses and loss expenses

	December 31,
	2012		2011
Outstanding loss reserves	$	1,539,114	$	1,366,466
Reserves for losses incurred but not reported		4,106,435		3,858,677
Reserve for losses and loss expenses	$	5,645,549	$	5,225,143

Reconciliation of beginning and ending liability for unpaid losses and loss expenses

		Year Ended December 31,
		2012		2011		2010
Gross liability at beginning of year		$	5,225,143	$	4,879,188	$	4,761,772
Reinsurance recoverable at beginning of year			(1,002,919)		(927,588)		(919,991)
Net liability at beginning of year			4,222,224		3,951,600		3,841,781
Net losses incurred related to:
	Commutation of variable-rated reinsurance contracts		0		11,529		8,864
	Current year		1,309,613		1,201,155		1,012,374
	Prior years		(170,349)		(253,528)		(313,355)
	Total incurred		1,139,264		959,156		707,883
Net paid losses related to:
	Current year		117,123		142,162		98,646
	Prior years		743,844		542,649		498,084
	Total paid		860,967		684,811		596,730
Foreign exchange revaluation			3,918		(3,721)		(1,334)
Net liability at end of year			4,504,439		4,222,224		3,951,600
Reinsurance recoverable at end of year			1,141,110		1,002,919		927,588
Gross liability at end of year		$	5,645,549	$	5,225,143	$	4,879,188