Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Finance lease cost:
Amortization of leased assets	$ 6,229	$ 6,549
Interest on lease liabilities	4,693	3,497
Sublease income	(3,130)	(3,130)
Total	28,862	26,528
Property operating expenses
Operating lease cost:
Lease expense	17,397	18,326
General and administrative expenses
Operating lease cost:
Lease expense	$ 3,673	$ 1,286