Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loss Contingencies [Line Items]
Estimated federal taxable income				$ 3,800
Federal taxable income			$ 7,000	4,800
Distributions paid			38,400	25,700
Net operating loss carryforwards			13,100	13,100
Accrued current tax expense		$ 55	38
Income Tax Expense (Benefit)	$ 1,600	(1,604)	(47)	2,726
Courtyard Kauai Coconut Beach Hotel Kauai [Member]
Loss Contingencies [Line Items]
Estimated federal taxable income		(2,100)
Net operating loss carryforwards		15,200
Income Tax Expense (Benefit)		1,600
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority		800
Income Tax Examination, Increase (Decrease) in Liability from Prior Year		800
Taxable REIT subsidiaries
Loss Contingencies [Line Items]
Net operating loss carryforwards		$ 4,500
AJS and Holstenplatz | Foreign Tax Authority
Loss Contingencies [Line Items]
Income tax related to sale of investment				$ 2,700
Accrued current tax expense			$ 100