Commitments and Contingencies (Narrative) (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($) agreement property	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) agreement
Loss Contingencies [Line Items]
Management fees incurred	$ 495	$ 324
Hotel and property operations	10,414	7,613
Incentive management fee	$ 65	25
Management agreement renewal additional term	1 year
Management agreement written notice of termination period	90 days
Number of hotels | property	18
Franchise costs	$ 1,222	668
Number of land lease agreements related to properties owned | agreement	0
Lease expense	$ 0	9	$ 154
Number of new leases entered into during period | agreement			3
Room rentals and other hotel services	16,679	10,361
Office Building [Member]
Loss Contingencies [Line Items]
Lease expense	$ 39	$ 38
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
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
Lease expiration			Dec. 31, 2021