Goodwill and other intangibles (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2020
Goodwill [Roll Forward]
Beginning balances		$ 248,890	$ 248,890
Acquisitions	$ 19,700		133,345
Ending balance	382,235		382,235
Title
Goodwill [Roll Forward]
Beginning balances		243,161	243,161
Acquisitions	112,600	1,000	113,642
Ending balance	356,803		356,803
Ancillary Services and Corporate
Goodwill [Roll Forward]
Beginning balances		$ 5,729	5,729
Acquisitions			19,703
Ending balance	$ 25,432		$ 25,432

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant