Leases - Lessee Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Right-of-use asset	$ 177,308	$ 183,809	$ 225,950
Lease liability, current	45,351	49,742	48,052
Lease liability, non-current	143,620	153,040	186,352
Present value of operating lease liabilities	$ 188,971	$ 202,782	$ 234,404