Net Investments in Hotels - Narratives (Details) - USD ($) $ in Thousands			3 Months Ended			6 Months Ended		12 Months Ended
	Feb. 05, 2018	Jan. 25, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Business Acquisition, Cost of Acquired Entity, Purchase Price
Assets Retired						$ 6,800	$ 15,900
Depreciation expense			$ 19,400	$ 18,900		38,000	38,200
Business interruption income			345	12,065		812	12,198
Proceeds sales of investment						0	135,301
Net gain (loss) on sale of real estate, net of tax						0	31,929
Real estate under construction			14,351			14,351		$ 10,298
Capitalized construction cost			200	900		500	1,500
Accrued capital expenditures						1,200		$ 5,500
Boca Raton Marriott | Assets Sold
Business Acquisition, Cost of Acquired Entity, Purchase Price
Ownership interest		100.00%
Contract price		$ 76,000
Proceeds sales of investment		35,400
Funds released from escrow		$ 1,400
Net gain (loss) on sale of real estate, net of tax					$ 12,300
Hampton Inn Boston Braintree | Assets Sold
Business Acquisition, Cost of Acquired Entity, Purchase Price
Ownership interest	100.00%
Contract price	$ 63,000
Proceeds sales of investment	31,800
Funds released from escrow	$ 2,000
Net gain (loss) on sale of real estate, net of tax					$ 19,600
Hurricane
Business Acquisition, Cost of Acquired Entity, Purchase Price
Cumulative gain on business interruption			21,800			21,800
Business interruption income			$ 300	$ 10,500		$ 800	$ 10,500