Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Accounts payable and accrued liabilities	$ 82,391
Operating leases - liabilities	785,705	$ 832,533
Total operating lease liabilities per the Condensed Consolidated Balance Sheet	$ 868,096
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent