Balance Sheet Components - Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 1,502,000		$ 1,532,000
Operating lease liabilities	1,596,000		1,613,000
Current operating lease liabilities	196,000		190,000
Non-current operating lease liabilities	1,400,000		$ 1,423,000
Cash paid for operating lease liabilities	57,490	$ 37,653
Right-of-use assets obtained in exchange for new operating lease obligations	$ 51,824	$ 842,395
ASU 2016-02
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets				$ 743,000