Acquisitions - Narrative (Details)					3 Months Ended
	Feb. 14, 2020 USD ($)	Dec. 19, 2019 USD ($)	Jun. 14, 2019 USD ($)	Jan. 30, 2019 USD ($)	Mar. 31, 2020 USD ($) acquisition	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Feb. 09, 2018 USD ($)
Business Acquisition [Line Items]
Number of acquisitions | acquisition					4
Cash consideration					$ 476,392,000				$ 29,525,000
Goodwill					851,459,000	$ 595,551,000
Revenue					602,461,000				532,441,000
Income before income taxes					24,689,000				39,379,000
Interest expense					11,054,000				5,673,000
Stratus Video
Business Acquisition [Line Items]
Initial purchase price					485,568,000
Cash consideration	$ 485,568,000
Acquisition-related costs					7,812,000
Fair value of tangible assets acquired	46,416,000
Cash and restricted cash received	9,176,000
Liabilities assumed	68,822,000
Identifiable intangible assets	252,000,000
Goodwill	255,974,000
Goodwill expected to be deductible for tax purposes	$ 10,186,000
Intangible assets acquired, weighted average useful life	17 years
Revenue					14,433,000
Income before income taxes					1,606,000
Incremental acquisition-related costs									11,681,000
Amortization of intangible assets									5,119,000
Interest expense									2,727,000
Stratus Video | Developed Technology
Business Acquisition [Line Items]
Identifiable intangible assets	$ 16,000,000
Stratus Video | Customer Relationships
Business Acquisition [Line Items]
Identifiable intangible assets	191,000,000
b4health
Business Acquisition [Line Items]
Initial purchase price		$ 23,006,000				$ 22,940,000
Cash consideration		19,906,000
Contingent earn-out payment (up to)		12,000,000
Estimated fair value of contingent earn-out payment		3,100,000
Fair value of tangible assets acquired		1,169,000
Cash and restricted cash received		222,000
Liabilities assumed		823,000
Identifiable intangible assets		9,000,000
Goodwill		$ 13,594,000
Intangible assets acquired, weighted average useful life		7 years
Final working capital settlement					$ 66,000
b4health | Developed Technology
Business Acquisition [Line Items]
Identifiable intangible assets		$ 3,000,000
b4health | Trademarks
Business Acquisition [Line Items]
Identifiable intangible assets		2,000,000
b4health | Customer Relationships
Business Acquisition [Line Items]
Identifiable intangible assets		$ 4,000,000
Advanced
Business Acquisition [Line Items]
Initial purchase price			$ 211,743,000					$ 211,816,000
Cash consideration			201,121,000				$ 73,000
Contingent earn-out payment (up to)			20,000,000
Estimated fair value of contingent earn-out payment			10,622,000
Fair value of tangible assets acquired			29,035,000
Cash and restricted cash received			2,497,000
Liabilities assumed			28,758,000
Identifiable intangible assets			91,700,000
Goodwill			119,839,000
Goodwill expected to be deductible for tax purposes			$ 57,121,000
Intangible assets acquired, weighted average useful life			9 years
Advanced | Developed Technology
Business Acquisition [Line Items]
Identifiable intangible assets			$ 3,400,000
Advanced | Customer Relationships
Business Acquisition [Line Items]
Identifiable intangible assets			68,000,000
Silversheet
Business Acquisition [Line Items]
Initial purchase price				$ 31,676,000					$ 31,676,000
Cash consideration				30,176,000
Contingent earn-out payment (up to)				25,000,000
Estimated fair value of contingent earn-out payment				1,500,000
Fair value of tangible assets acquired				2,826,000
Cash and restricted cash received				651,000
Liabilities assumed				1,567,000
Identifiable intangible assets				6,880,000
Goodwill				$ 23,537,000
Intangible assets acquired, weighted average useful life				8 years
Silversheet | Based on operating results for the twelve months ending December 31, 2019
Business Acquisition [Line Items]
Contingent earn-out payment (up to)				$ 6,000,000
Silversheet | Based on operating results for the twelve months ending December 31, 2020
Business Acquisition [Line Items]
Contingent earn-out payment (up to)				19,000,000
Silversheet | Developed Technology
Business Acquisition [Line Items]
Identifiable intangible assets				5,300,000
Silversheet | Trademarks
Business Acquisition [Line Items]
Identifiable intangible assets				$ 1,500,000
Revolving Credit Facility | Line of Credit
Business Acquisition [Line Items]
Maximum borrowing capacity										$ 400,000,000
Term Loan | Term Debt
Business Acquisition [Line Items]
Term loan credit facility	$ 250,000,000		$ 150,000,000