Acquisitions (Details) - USD ($) $ in Thousands			3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 23, 2019	Sep. 16, 2019	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill			$ 594,561	$ 594,561	$ 599,351
Accent
Business Acquisition [Line Items]
Acquisition of a business, net of cash acquired	$ 157,600
Change in value of accounts receivable			2,300
Change in value of cash and cash equivalents			500
Change in value of accounts payable and accrued liabilities			(1,000)
Change in carrying value of goodwill			(4,800)
Change in value of total consideration paid			(1,000)
Acquisition related costs					$ 2,100
Revenue contributed			10,800	21,700
Intangible assets			68,400	68,400
Goodwill			$ 76,755	$ 76,755
VitreosHealth, Inc.
Business Acquisition [Line Items]
Aggregate consideration		$ 36,600
Intangible assets		6,000
Goodwill		$ 30,200