Leases (Leased Assets and Liabilities) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Assets
Operating lease right-of-use assets	$ 67,322
Riverwalk impairment	(10,235)
Total leased assets	57,087	$ 69,398
Liabilities
Operating lease liabilities	$ 69,246	$ 70,413