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Goodwill and other intangibles (Tables)
 9 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of goodwill The summary of changes in goodwill is as follows.
TitleAncillary Services and CorporateConsolidated Total
($000 omitted)
Balances at December 31, 2019243,161 5,729 248,890 
Acquisitions113,642 19,703 133,345 
Balances at September 30, 2020356,803 25,432 382,235