Goodwill and other intangibles (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of goodwill

The summary of changes in goodwill is as follows:

	Title		Ancillary Services and Corporate	Total
	($000 omitted)
Balances at January 1, 2017	211,365		5,729	217,094
Acquisitions	14,419		—	14,419
Disposals	(85	)	—	(85	)
Balances at December 31, 2017	225,699		5,729	231,428
Acquisitions	17,504		—	17,504
Disposals	(42	)	—	(42	)
Balances at December 31, 2018	243,161		5,729	248,890