Recognized Amounts of Identifiable Assets Acquired and Liabilities Assumed 2018 (Details) - USD ($) $ in Thousands	Dec. 31, 2019	May 02, 2018
Business Acquisition [Line Items]
Cash	$ 28,395
Accounts receivable and other tangible assets	38,255
Accounts payable and other liabilities	(16,860)
Deferred revenue	(6,880)
Net deferred tax liabilities	(65,712)
Total identifiable net assets	280,993
Goodwill	841,771
Developed Software and Core Technologies
Business Acquisition [Line Items]
Finite-lived intangible assets	225,163
Customer Lists
Business Acquisition [Line Items]
Finite-lived intangible assets	61,659
Trade Names
Business Acquisition [Line Items]
Finite-lived intangible assets	$ 17,230
OPTIS
Business Acquisition [Line Items]
Cash		$ 7,957
Accounts receivable and other tangible assets		15,910
Accounts payable and other liabilities		(11,941)
Deferred revenue		(2,470)
Net deferred tax liabilities		(23,438)
Total identifiable net assets		85,667
Goodwill		205,316
OPTIS | Developed Software and Core Technologies
Business Acquisition [Line Items]
Finite-lived intangible assets		47,597
OPTIS | Customer Lists
Business Acquisition [Line Items]
Finite-lived intangible assets		41,303
OPTIS | Trade Names
Business Acquisition [Line Items]
Finite-lived intangible assets		$ 10,749