Balance Sheet Components - Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Leases [Abstract]
Cash paid for operating lease liabilities	$ 82,439	$ 57,490
Right-of-use assets obtained in exchange for new operating lease obligations	49,445	$ 51,824
Operating lease right-of-use assets, net	2,007,729		$ 2,037,726
Current operating lease liabilities	268,087		256,222
Non-current operating lease liabilities	1,911,892		1,945,631
Total operating lease liabilities	$ 2,179,979		$ 2,201,853