Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents, and restricted cash	$ 7,804,618	$ 8,436,453	$ 8,238,870	$ 7,180,046	$ 5,178,187	$ 5,043,786
Cash and cash equivalents
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents, and restricted cash	7,777,530		8,205,550
Other Current Assets
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents, and restricted cash	2,689		1,783
Non-current Assets
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents, and restricted cash	24,399		31,537
Cash
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents, and restricted cash	4,089,903		3,364,927
Cash | Cash and cash equivalents
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents, and restricted cash	4,062,961		3,331,860
Cash | Other Current Assets
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents, and restricted cash	2,689		1,783
Cash | Non-current Assets
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents, and restricted cash	24,253		31,284
Level 1 Securities | Money market funds
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents, and restricted cash	3,414,292		4,573,943
Level 1 Securities | Money market funds | Cash and cash equivalents
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents, and restricted cash	3,414,146		4,573,690
Level 1 Securities | Money market funds | Other Current Assets
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents, and restricted cash	0		0
Level 1 Securities | Money market funds | Non-current Assets
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents, and restricted cash	146		253
Level 2 Securities | Foreign Time Deposits
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents, and restricted cash	300,423		300,000
Level 2 Securities | Foreign Time Deposits | Cash and cash equivalents
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents, and restricted cash	300,423		300,000
Level 2 Securities | Foreign Time Deposits | Other Current Assets
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents, and restricted cash	0		0
Level 2 Securities | Foreign Time Deposits | Non-current Assets
Cash and Cash Equivalents [Line Items]
Cash, cash equivalents, and restricted cash	$ 0		$ 0