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