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Cash, Concentration of Credit Risk and Fair Value of Financial Instruments - Fair Value of Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Assets:      
Money market and demand accounts $ 746,195 $ 488,733 $ 524,771
Commercial paper 0 14,548  
Total 957,932 959,457  
Liabilities:      
Contingent consideration resulting from the Technicolor Acquisition   19,800  
Total   19,800  
Money market and demand accounts      
Assets:      
Money market and demand accounts 746,195 488,733  
U.S. government securities      
Assets:      
Securities 113,541 289,576  
Corporate bonds, asset backed and other securities      
Assets:      
Securities 98,196 166,600  
Level 1      
Assets:      
Commercial paper 0 0  
Total 746,195 488,733  
Liabilities:      
Contingent consideration resulting from the Technicolor Acquisition   0  
Total   0  
Level 1 | Money market and demand accounts      
Assets:      
Money market and demand accounts 746,195 488,733  
Level 1 | U.S. government securities      
Assets:      
Securities 0 0  
Level 1 | Corporate bonds, asset backed and other securities      
Assets:      
Securities 0 0  
Level 2      
Assets:      
Commercial paper 0 14,548  
Total 211,737 470,724  
Liabilities:      
Contingent consideration resulting from the Technicolor Acquisition   0  
Total   0  
Level 2 | Money market and demand accounts      
Assets:      
Money market and demand accounts 0 0  
Level 2 | U.S. government securities      
Assets:      
Securities 113,541 289,576  
Level 2 | Corporate bonds, asset backed and other securities      
Assets:      
Securities 98,196 166,600  
Level 3      
Assets:      
Commercial paper 0 0  
Total 0 0  
Liabilities:      
Total   19,800  
Level 3 | Money market and demand accounts      
Assets:      
Money market and demand accounts 0 0  
Level 3 | U.S. government securities      
Assets:      
Securities 0 0  
Level 3 | Corporate bonds, asset backed and other securities      
Assets:      
Securities $ 0 $ 0