Real Estate and Operating Real Estate - Narratives (Details) $ in Thousands	3 Months Ended		6 Months Ended		10 Months Ended
	Jun. 30, 2018 USD ($) property $ / €	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) property $ / €	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) property $ / €	Dec. 31, 2017 USD ($) property $ / €	Sep. 30, 2017 USD ($)
Foreign Currency Translation
Capitalized construction costs	$ 13,300		$ 13,300		$ 13,300
Effects of foreign currency translation on balance sheet item	(54,804)	$ 50,309	(27,869)	$ 58,918
Construction In projects placed into service			5,800
Decrease in insurance liability			(1,200)
Proceeds from insurance settlements			1,874	0
Assets held for sale, net	3,189		3,189		3,189	$ 0
Shelborne
Foreign Currency Translation
Unfunded commitment	28,200		28,200		28,200
Land, buildings and improvements, net
Foreign Currency Translation
Assets held for sale, net	3,189		3,189		$ 3,189	$ 0
Real estate
Foreign Currency Translation
Effects of foreign currency translation on balance sheet item			(32,800)
Depreciation expense including effects of foreign currency translation	$ 16,500	15,900	$ 33,800	32,200
Real estate under construction
Foreign Currency Translation
Number of open built to suit projects | property	2		2		2	3
Unfunded commitment	$ 40,200		$ 40,200		$ 40,200	$ 56,500
Operating real estate
Foreign Currency Translation
Depreciation expense including effects of foreign currency translation	2,200	$ 1,700	3,900	$ 3,300
Hotel
Foreign Currency Translation
Insurance deductible							$ 1,800
Allowance for insurance receivables	2,000		2,000
Property damage insurance receivables	$ 23,200		23,200		23,200
Decrease in insurance liability			$ (1,200)
Proceeds from insurance settlements					$ 3,200
Euro
Foreign Currency Translation
Increase decrease in foreign currency exchange rate	(2.80%)		(2.80%)		(2.80%)
Foreign currency exchange rate | $ / €	1.1658		1.1658		1.1658	1.1993