Segment information (Tables)

6 Months Ended

Jun. 30, 2020

Segment Reporting [Abstract]

Summary segment information

The following table provides summary information regarding premiums written and earned by line of business and net premiums written by underwriting location:

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
	($ in thousands)
Gross premiums written:
Casualty reinsurance	$	25,125	$	32,557	$	108,943	$	108,158
Other specialty reinsurance	21,080		37,836		57,960		62,134
Property catastrophe reinsurance	11,253		5,929		21,085		11,921
Insurance programs and coinsurance	100,469		85,656		204,841		166,454
Total	$	157,927	$	161,978	$	392,829	$	348,667
Net premiums written:
Casualty reinsurance	$	24,774	$	32,077	$	108,441	$	107,142
Other specialty reinsurance	19,843		36,523		55,327		59,705
Property catastrophe reinsurance	10,506		5,621		20,338		11,603
Insurance programs and coinsurance	50,733		45,149		108,450		86,307
Total	$	105,856	$	119,370	$	292,556	$	264,757
Net premiums earned:
Casualty reinsurance	$	48,146	$	67,506	$	100,911	$	130,819
Other specialty reinsurance	29,876		42,635		65,240		87,196
Property catastrophe reinsurance	5,824		3,119		10,708		6,090
Insurance programs and coinsurance	47,689		38,058		94,715		73,307
Total	$	131,535	$	151,318	$	271,574	$	297,412
Net premiums written by underwriting location:
United States	$	27,798	$	22,385	$	64,101	$	40,787
Europe	22,921		23,927		44,124		47,185
Bermuda	55,137		73,058		184,331		176,785
Total	$	105,856	$	119,370	$	292,556	$	264,757