Goodwill and other intangibles (Tables)

9 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of changes in goodwill

The summary of changes in goodwill is as follows.

	Title		Ancillary Services and Corporate	Consolidated Total
			($000 omitted)
Balances at December 31, 2016	211,365		5,729	217,094
Acquisitions	14,419		—	14,419
Disposals	(85	)	—	(85	)
Balances at September 30, 2017	225,699		5,729	231,428