Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Finance lease cost:
Amortization of leased assets	$ 2,243	$ 2,092
Interest on lease liabilities	1,379	1,002
Sublease income	(1,043)	(1,886)
Total	10,338	8,982
Property operating expenses
Operating lease cost:
Lease expense	6,492	7,412
General and administrative expenses
Operating lease cost:
Lease expense	$ 1,267	$ 362