Commitments and Contingencies (Narrative) (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) agreement	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2016 agreement
Loss Contingencies [Line Items]
Management fees incurred	$ 474	$ 495
Incentive management fee	$ 44	65
Management agreement renewal additional term	1 year
Management agreement written notice of termination period	90 days
Cost of goods and services sold	$ 9,793	10,414
Office Building [Member]
Loss Contingencies [Line Items]
Number of new leases entered into during period | agreement				3
Office lease expense		39
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				Dec. 31, 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	$ 1,227	$ 1,222