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Significant Accounting Policies - Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Restricted cash        
Cash and cash equivalents $ 717,804 $ 419,693 $ 397,094  
Restricted cash included in other current assets 347 300 2  
Restricted cash included in other assets 500   500  
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows $ 718,651 $ 420,497 $ 397,596 $ 312,237