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Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted and restricted cash equivalents and investments	$ 3,260,826	$ 3,284,061
Fair Value Measurements on a Recurring Basis
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and investments	1,373,721	1,342,085
Total restricted cash equivalents and investments	1,060,558	1,159,963
Total unrestricted and restricted cash equivalents and investments	2,434,279	2,502,048
Fair Value Measurements on a Recurring Basis | Level 1
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and investments	88,630	0
Total restricted cash equivalents and investments	126,649	24,757
Total unrestricted and restricted cash equivalents and investments	215,279	24,757
Fair Value Measurements on a Recurring Basis | Level 2
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and investments	1,285,091	1,342,085
Total restricted cash equivalents and investments	933,909	1,135,206
Total unrestricted and restricted cash equivalents and investments	2,219,000	2,477,291
Fair Value Measurements on a Recurring Basis | Level 3
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and investments	0	0
Total restricted cash equivalents and investments	0	0
Total unrestricted and restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis | Money market funds
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and investments	88,630
Total restricted cash equivalents and investments	126,649	24,757
Fair Value Measurements on a Recurring Basis | Money market funds | Level 1
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and investments	88,630
Total restricted cash equivalents and investments	126,649	24,757
Fair Value Measurements on a Recurring Basis | Money market funds | Level 2
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and investments	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis | Money market funds | Level 3
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and investments	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis | Certificates of deposit
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and investments	864,598	677,777
Total restricted cash equivalents and investments	606,331	481,365
Fair Value Measurements on a Recurring Basis | Certificates of deposit | Level 1
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis | Certificates of deposit | Level 2
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and investments	864,598	677,777
Total restricted cash equivalents and investments	606,331	481,365
Fair Value Measurements on a Recurring Basis | Certificates of deposit | Level 3
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis | Commercial paper
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and investments	312,873	376,789
Total restricted cash equivalents and investments	258,637	469,240
Fair Value Measurements on a Recurring Basis | Commercial paper | Level 1
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis | Commercial paper | Level 2
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and investments	312,873	376,789
Total restricted cash equivalents and investments	258,637	469,240
Fair Value Measurements on a Recurring Basis | Commercial paper | Level 3
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis | Corporate bonds
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and investments	107,620	287,519
Total restricted cash equivalents and investments	68,941	184,601
Fair Value Measurements on a Recurring Basis | Corporate bonds | Level 1
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis | Corporate bonds | Level 2
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and investments	107,620	287,519
Total restricted cash equivalents and investments	68,941	184,601
Fair Value Measurements on a Recurring Basis | Corporate bonds | Level 3
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and investments	0	0
Total restricted cash equivalents and investments	$ 0	$ 0

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