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Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash and Cash Equivalents [Line Items]        
Cash $ 2,572,685 $ 2,072,296    
Cash and Cash Equivalents 3,794,483 2,822,795    
Restricted Cash 16,260 4,367    
Restricted Cash and Cash Equivalents 17,558 5,643    
Cash and Restricted Cash 2,588,945 2,076,663    
Total Cash, cash equivalents, and restricted cash and cash equivalents 3,812,041 2,822,795 $ 1,467,576 $ 1,809,330
Cash, Cash Equivalents And Restricted Cash   2,828,438    
Fair Value, Measurements, Recurring | Level 1 Securities | Money market funds        
Cash and Cash Equivalents [Line Items]        
Money market funds 1,221,798 449,734    
Fair Value, Measurements, Recurring | Level 2 Securities        
Cash and Cash Equivalents [Line Items]        
Time Deposits   300,765    
Money market funds | Fair Value, Measurements, Recurring | Level 1 Securities        
Cash and Cash Equivalents [Line Items]        
Non-current Assets, Securities 1,298 1,276    
Cash Equivalents and Restricted Cash Equivalents $ 1,223,096 451,010    
Bank Time Deposits | Fair Value, Measurements, Recurring | Level 2 Securities        
Cash and Cash Equivalents [Line Items]        
Non-current Assets, Securities   0    
Cash Equivalents and Restricted Cash Equivalents   $ 300,765