Business Acquisitions (Details textual) - USD ($) $ in Thousands	Oct. 16, 2018	Sep. 10, 2018	Sep. 30, 2019	Dec. 31, 2018	Feb. 06, 2018
Business Acquisition [Line Items]
Goodwill			$ 1,354,795	$ 904,571
Acyclica [Member]
Business Acquisition [Line Items]
Goodwill		$ 7,000
Business Combination, Consideration Transferred		$ 9,700
SeaPilot [Member]
Business Acquisition [Line Items]
Goodwill	$ 3,000
Business Combination, Consideration Transferred	$ 4,600
Consumer and Small and Medium-Sized Security Business [Member] | Held-for-sale [Member]
Business Acquisition [Line Items]
Carrying amount of disposal group					$ 28,800