Leases (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Leases (Details) [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ (5,200)
Real Estate Investment Property, Accumulated Depreciation	$ 971,738		$ 909,893
Hotel Ground Lease [Member]
Leases (Details) [Line Items]
Number of Properties Subject to Ground Leases	13
Number of Leases Classified as Finance Leases	4
Real Estate Investment Property, Accumulated Depreciation	$ 2,100
Parking Lot Ground Lease [Member]
Leases (Details) [Line Items]
Number of Properties Subject to Ground Leases	3
Hotel and Parking Lot Ground Leases [Member]
Leases (Details) [Line Items]
Number of Leases Classified as Operating Leases	12
Minimum [Member] | Hotel and Parking Lot Ground Leases [Member]
Leases (Details) [Line Items]
Lessee, Lease Term of Contract	4 years
Lessee, Lease Renewal Term	5 years
Maximum [Member] | Hotel and Parking Lot Ground Leases [Member]
Leases (Details) [Line Items]
Lessee, Lease Term of Contract	86 years
Lessee, Lease Renewal Term	120 years