Commitments and Contingencies (Details Textual) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($) hotel_room extension_option	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)
Management Agreements [Line Items]
Combined base and incentive management fees	$ 5,300	$ 5,400
Commitments and Contingencies (Textual) [Abstract]
Reserve funds allowed for hotel maintenance from hotel revenue	4.00%
Restricted cash	$ 7,254			$ 7,123
Total number of guest rooms | hotel_room	6,972
Ground rent expense	$ 3,100	$ 3,300
Hotel Zeppelin San Francisco [Member]
Commitments and Contingencies (Textual) [Abstract]
Number of guest rooms, leasehold interest | hotel_room	64
Total number of guest rooms | hotel_room	196
Monaco Washington DC [Member]
Commitments and Contingencies (Textual) [Abstract]
Ground lease expiry period	2059
Base rent	$ 200
Argonaut Hotel [Member]
Commitments and Contingencies (Textual) [Abstract]
Ground lease expiry period	2059
Base rent	$ 1,300
Hotel Zelos San Francisco [Member]
Commitments and Contingencies (Textual) [Abstract]
Ground lease expiry period	2097
Hotel Zephyr Fisherman's Wharf [Member]
Commitments and Contingencies (Textual) [Abstract]
Base rent			$ 100
Hotel Zephyr Fisherman's Wharf [Member] | Primary lease [Member]
Commitments and Contingencies (Textual) [Abstract]
Ground lease expiry period	2062
Ground lease percentage rent on hotel revenues			5.00%
Ground lease percentage rent on retail revenues			7.50%
Ground lease percentage rent on hotel revenues	6.00%
Ground lease percentage rent on retail and parking revenues	7.50%
Hotel Zeppelin San Francisco [Member]
Commitments and Contingencies (Textual) [Abstract]
Ground lease expiry period	2059
Base rent	$ 500
Ground lease extension option	30 years
Number of extension options | extension_option	1
Hotel Palomar Los Angeles - Beverly Hills [Member]
Commitments and Contingencies (Textual) [Abstract]
Ground lease expiry period	2107
Base rent	$ 3,800
Ground lease extension option	5 years
Number of extension options | extension_option	19
Union Station Hotel Nashville [Member]
Commitments and Contingencies (Textual) [Abstract]
Ground lease expiry period	2105
Base rent	$ 100
Minimum [Member]
Management Agreements [Line Items]
Terms of management agreements not including renewals	5 years
Terms of management agreements including renewals	5 years
Termination fees range	0
Base management fee from hotel revenues	2.00%
Minimum [Member] | Hotel Zelos San Francisco [Member]
Commitments and Contingencies (Textual) [Abstract]
Base rent increase	2.00%
Maximum [Member]
Management Agreements [Line Items]
Terms of management agreements not including renewals	21 years
Terms of management agreements including renewals	52 years
Termination fees range	5
Base management fee from hotel revenues	4.00%
Maximum [Member] | Hotel Zelos San Francisco [Member]
Commitments and Contingencies (Textual) [Abstract]
Base rent increase	4.00%