Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents and restricted cash	$ 8,238,870	$ 5,043,786	$ 3,812,041	$ 2,822,795
Cash
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents and restricted cash	3,364,927	3,127,549
Level 1 securities | Money market funds
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents and restricted cash	4,573,943	1,616,237
Level 2 securities | Foreign Time Deposits
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents and restricted cash	300,000	300,000
Cash and cash equivalents
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents and restricted cash	8,205,550	5,018,437
Cash and cash equivalents | Cash
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents and restricted cash	3,331,860	3,103,525
Cash and cash equivalents | Level 1 securities | Money market funds
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents and restricted cash	4,573,690	1,614,912
Cash and cash equivalents | Level 2 securities | Foreign Time Deposits
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents and restricted cash	300,000	300,000
Other Current Assets
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents and restricted cash	1,783	1,863
Other Current Assets | Cash
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents and restricted cash	1,783	1,863
Other Current Assets | Level 1 securities | Money market funds
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents and restricted cash	0	0
Other Current Assets | Level 2 securities | Foreign Time Deposits
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents and restricted cash		0
Non-current Assets
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents and restricted cash	31,537	23,486
Non-current Assets | Cash
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents and restricted cash	31,284	22,161
Non-current Assets | Level 1 securities | Money market funds
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents and restricted cash	253	1,325
Non-current Assets | Level 2 securities | Foreign Time Deposits
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents and restricted cash	$ 0	$ 0