Additional Cash Flow Information (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 6,304,330	$ 5,988,187	$ 3,593,412	$ 3,109,322
Cash, cash equivalents and restricted cash per condensed consolidated statement of cash flows	6,312,907	5,988,845	3,601,964	3,120,681
Prepaid expenses and other current assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	8,577	658	8,552	8,004
Other assets
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	$ 0	$ 0	$ 0	$ 3,355