Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Finance lease cost:
Amortization of leased assets	$ 2,035	$ 2,243
Interest on lease liabilities	1,663	1,379
Sublease income	(1,043)	(1,043)
Total	9,198	10,338
Property operating expenses
Operating lease cost:
Lease expense	5,358	6,492
General and administrative expenses
Operating lease cost:
Lease expense	$ 1,185	$ 1,267