Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Finance lease cost:
Amortization of leased assets	$ 6,120	$ 6,229
Interest on lease liabilities	4,950	4,693
Sublease income	(5,972)	(3,130)
Total	24,989	28,862
Property operating expenses
Operating lease cost:
Lease expense	16,430	17,397
General and administrative expenses
Operating lease cost:
Lease expense	$ 3,461	$ 3,673