Summary Of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)
Operating lease right-of-use assets	$ 105,671,000			$ 90,900,000
Operating lease liabilities	109,927,000			$ 92,500,000
Impact of ASU 2018-15 adoption	$ 2,500,000	$ 1,400,000	$ 2,800,000
Lease license to license revenue	50.00%
Lease license to maintenance revenue	50.00%
Amortization of intangible assets	$ 36,900,000	40,800,000	49,800,000
Provisions for doubtful accounts	2,928,000	1,577,000	1,474,000
Net foreign exchange losses	$ (2,500,000)	$ (3,100,000)	$ (1,900,000)
Minimum
Semiconductor product licenses, term	24 months
Property and equipment, estimated useful lives (years)	1 year
Finite-lived intangible asset, useful life	2 years
Maximum
Semiconductor product licenses, term	36 months
Property and equipment, estimated useful lives (years)	40 years
Finite-lived intangible asset, useful life	17 years
Customer Concentration Risk
Number of customers with more than five percent of revenue	0	0	0