Commitments and Contingencies (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) agreement	Jun. 30, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2016 agreement
Loss Contingencies [Line Items]
Management fees incurred	$ 472	$ 524	$ 946	$ 1,019
Incentive management fee	33	116	$ 77	181
Management agreement renewal additional term			1 year
Management agreement written notice of termination period			90 days
Cost of goods and services sold	9,755	10,756	$ 19,548	21,170
Office Building [Member]
Loss Contingencies [Line Items]
Number of new leases entered into during period | agreement						3
Office lease expense	39	39	$ 78	78
Forecast [Member] | Office Building [Member]
Loss Contingencies [Line Items]
Office lease expense					$ 154
Minimum [Member]
Loss Contingencies [Line Items]
Management fee percent			3.00%
Management agreement term			1 year
Franchise fee percent			3.30%
Other franchiser programs and service fee percent			2.50%
Franchise agreement term			10 years
Minimum [Member] | Office Building [Member]
Loss Contingencies [Line Items]
Lease expiration						Jan. 01, 2019
Maximum [Member]
Loss Contingencies [Line Items]
Management fee percent			3.50%
Incentive fee percent			5.00%
Management agreement term			3 years
Franchise fee percent			5.50%
Other franchiser programs and service fee percent			6.00%
Franchise agreement term			25 years
Maximum [Member] | Office Building [Member]
Loss Contingencies [Line Items]
Lease expiration						Dec. 31, 2021
Land [Member]
Loss Contingencies [Line Items]
Number of land lease agreements related to properties owned | agreement			0
Franchise [Member]
Loss Contingencies [Line Items]
Cost of goods and services sold	$ 1,246	$ 1,295	$ 2,473	$ 2,517