Reinsurance (Tables)

12 Months Ended

Dec. 31, 2015

Reinsurance [Abstract]

Premiums Written And Earned And Incurred Losses And LAE

	Years Ended December 31,
(Dollars in thousands)	2015			2014			2013
Written premiums:
Direct	$	1,569,791		$	1,227,645		$	1,268,698
Assumed		4,306,501			4,521,342			3,949,936
Ceded		(498,031	)		(492,084	)		(213,813	)
Net written premiums	$	5,378,261		$	5,256,903		$	5,004,821
Premiums earned:
Direct	$	1,491,163		$	1,183,498		$	1,207,833
Assumed		4,485,021			4,405,253			3,748,824
Ceded		(494,725	)		(419,616	)		(203,114	)
Net premiums earned	$	5,481,459		$	5,169,135		$	4,753,543
Incurred losses and LAE:
Direct	$	1,268,896		$	1,100,037		$	1,173,177
Assumed		2,152,633			2,160,663			1,833,055
Ceded		(319,614	)		(354,166	)		(205,981	)
Net incurred losses and LAE	$	3,101,915		$	2,906,534		$	2,800,251