Balance Sheet Components - Leases (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 1,008,000	$ 1,008,000
Non-current operating lease liabilities	946,320	946,320
Total lease liabilities	1,083,982	1,083,982
Lease Cost:
Lease costs	98,000	202,000
Operating lease cost	48,000	91,000
Short-term lease cost	50,000	111,000
Cash paid for operating lease liabilities	41,320	78,973
Right-of-use assets obtained in exchange for new operating lease obligations	$ 230,499	$ 1,072,894
Weighted-average remaining lease term	8 years 6 months	8 years 6 months
Weighted-average discount rate	5.40%	5.40%
Maturities of Lease Liabilities
2020	$ 185,631	$ 185,631
2021	172,295	172,295
2022	168,560	168,560
2023	147,740	147,740
2024	137,937	137,937
Thereafter	572,524	572,524
Total lease liabilities	1,384,687	1,384,687
Less imputed interest	(300,705)	(300,705)
Current operating lease liabilities	137,662	137,662
Operating lease, liability, leases not commenced	$ 1,185,000	$ 1,185,000
ASU 2016-02
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets			$ 743,000
Non-current operating lease liabilities			$ 813,000
Minimum
Lessee, Lease, Description [Line Items]
Lease term of contract	1 year	1 year
Lease renewal term	1 year	1 year
Maturities of Lease Liabilities
Lease not yet commenced, term of contract	2 years	2 years
Maximum
Lessee, Lease, Description [Line Items]
Lease term of contract	15 years	15 years
Lease renewal term	15 years	15 years
Maturities of Lease Liabilities
Lease not yet commenced, term of contract	15 years	15 years