Leases (Components of Lease Expense) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Finance lease cost:
Amortization of leased assets	$ 7,795
Interest on lease liabilities	4,748
Sublease income	(4,173)
Total	35,190
Property operating expenses
Operating lease cost:
Lease expense	25,166
General and administrative expenses
Operating lease cost:
Lease expense	$ 1,654