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
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-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Acquisitions - Goodwill (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 21, 2020	Dec. 31, 2019	Dec. 31, 2018
Acquisitions
Goodwill	$ 873,779		$ 806,421	$ 806,421
Aurelia Health, LLC
Acquisitions
Goodwill		$ 67,358