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Financial Instruments (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]        
Document Period End Date Sep. 30, 2019      
Cash $ 28,119 $ 37,190    
Time deposits 4,884 3,810    
Money Market Funds (level 1) 85,676 120,832    
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value 1,120,723 1,117,175    
Total 1,239,402 1,279,007    
Included in Cash and cash equivalents 109,288 357,415    
Restricted Cash Equivalents, Noncurrent 9,391 9,338    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 118,679 366,753 $ 240,892 $ 475,139
Included in Marketable securities $ 1,120,723 $ 912,254