Reserve For Losses And Loss Expenses (Tables)

12 Months Ended

Dec. 31, 2011

Reserve For Losses And Loss Expenses [Abstract]

Schedule Of Reserve For Losses And Loss Expenses

	2011		2010
OSLR	$	1,366,466	$	1,166,516
IBNR		3,858,677		3,712,672
Reserve for losses and loss expenses	$	5,225,143	$	4,879,188

Schedule Of Reconciliation Of Unpaid Losses And Loss Expenses

	2011			2010			2009
Gross liability at beginning of year	$	4,879,188		$	4,761,772		$	4,576,828
Reinsurance recoverable at beginning of year		(927,588	)		(919,991	)		(888,314	)
Net liability at beginning of year		3,951,600			3,841,781			3,688,514
Net losses incurred related to:
Commutation of variable-rated reinsurance contracts		11,529			8,864			—
Current year		1,201,155			1,012,374			852,052
Prior years		(253,528	)		(313,355	)		(247,992	)
Total incurred		959,156			707,883			604,060
Net paid losses related to:
Current year		142,162			98,646			42,320
Prior years		542,649			498,084			415,901
Total paid		684,811			596,730			458,221
Foreign exchange revaluation		(3,721	)		(1,334	)		7,428
Net liability at end of year		4,222,224			3,951,600			3,841,781
Reinsurance recoverable at end of year		1,002,919			927,588			919,991
Gross liability at end of year	$	5,225,143		$	4,879,188		$	4,761,772