Reinsurance (Tables)

12 Months Ended

Dec. 31, 2018

Reinsurance Disclosures [Abstract]

Effect Of Reinsurance And Retrocessional Reinsurance On Consolidated Premiums Written And Earned

The following tables summarize the effect of reinsurance and retrocessional reinsurance on premiums written and earned.

	Year Ended December 31,
	2018
(dollars in thousands)	Direct		Assumed		Ceded			Net Premiums
Underwriting:
Written	$	4,562,256	$	1,236,740	$	(1,013,406	)	$	4,785,590
Earned	$	4,384,562	$	1,291,032	$	(964,549	)	$	4,711,045
Program services:
Written	2,022,548		42,925		(2,063,485		)	1,988
Earned	1,850,656		28,581		(1,878,222		)	1,015
Consolidated:
Written	$	6,584,804	$	1,279,665	$	(3,076,891	)	$	4,787,578
Earned	$	6,235,218	$	1,319,613	$	(2,842,771	)	$	4,712,060

	Year Ended December 31,
	2017
(dollars in thousands)	Direct		Assumed		Ceded			Net Premiums
Underwriting:
Written	$	3,919,602	$	1,333,505	$	(835,320	)	$	4,417,787
Earned	$	3,777,335	$	1,286,043	$	(815,400	)	$	4,247,978
Program services:
Written	252,865		988		(253,853		)	—
Earned	291,287		1,352		(292,639		)	—
Consolidated:
Written	$	4,172,467	$	1,334,493	$	(1,089,173	)	$	4,417,787
Earned	$	4,068,622	$	1,287,395	$	(1,108,039	)	$	4,247,978

	Year Ended December 31,
	2016
(dollars in thousands)	Direct		Assumed		Ceded			Net Premiums
Underwriting:
Written	$	3,560,635	$	1,236,010	$	(795,625	)	$	4,001,020
Earned	$	3,506,687	$	1,176,205	$	(817,022	)	$	3,865,870
Program services:
Written	—		—		—			—
Earned	—		—		—			—
Consolidated:
Written	$	3,560,635	$	1,236,010	$	(795,625	)	$	4,001,020
Earned	$	3,506,687	$	1,176,205	$	(817,022	)	$	3,865,870