Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Finance lease cost:
Amortization of leased assets	$ 4,111	$ 4,043
Interest on lease liabilities	3,310	2,695
Sublease income	(1,267)	(2,087)
Total	19,046	19,716
Property operating expenses
Operating lease cost:
Lease expense	10,538	12,516
General and administrative expenses
Operating lease cost:
Lease expense	$ 2,354	$ 2,549