Goodwill and other intangibles (Tables)

12 Months Ended

Dec. 31, 2016

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, 2015	202,002		49,866		251,868
Re-allocation of goodwill	3,951		(3,951	)	—
Acquisitions	7,220		—		7,220
Purchase adjustments	—		(5,268	)	(5,268	)
Impairment	(1,569	)	(34,180	)	(35,749	)
Disposals	(349	)	—		(349	)
Balances at December 31, 2015	211,255		6,467		217,722
Acquisitions	300		—		300
Disposals	(190	)	(738	)	(928	)
Balances at December 31, 2016	211,365		5,729		217,094