Reinsurance (Tables)

12 Months Ended

Dec. 31, 2017

Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]

Effect Of Reinsurance And Retrocessional Activity On Premiums Written And Earned And On Net Claims And Claim Expenses Incurred

The following table sets forth the effect of reinsurance and retrocessional activity on premiums written and earned and on net claims and claim expenses incurred:

Year ended December 31,	2017			2016			2015
Premiums written
Direct	$	290,730		$	208,282		$	130,681
Assumed	2,506,810			2,166,294			1,880,629
Ceded	(926,215		)	(839,264		)	(595,127		)
Net premiums written	$	1,871,325		$	1,535,312		$	1,416,183
Premiums earned
Direct	$	244,285		$	157,112		$	98,182
Assumed	2,307,219			1,874,993			1,769,088
Ceded	(833,929		)	(628,675		)	(466,719		)
Net premiums earned	$	1,717,575		$	1,403,430		$	1,400,551
Claims and claim expenses
Gross claims and claim expenses incurred	$	3,420,388		$	710,651		$	544,972
Claims and claim expenses recovered	(1,558,960		)	(179,820		)	(96,734		)
Net claims and claim expenses incurred	$	1,861,428		$	530,831		$	448,238