Acquisitions - Fair Value of Consideration Transferred 2018 (Details) - USD ($) $ in Thousands		12 Months Ended
May 02, 2018	Dec. 31, 2020	Dec. 31, 2019
Cash		$ 597,342	$ 820,084
OPTIS
Cash	$ 290,983

Amount of tangible or intangible assets, including a business or subsidiary of the acquirer transferred by the entity to the former owners of the acquiree. Excludes cash.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration