Basis of Presentation - Foreign Currencies (Details)	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
British Pound Sterling
Real Estate Properties
Foreign currency exchange rate	1.2273	1.3204
Increase (decrease) in foreign currency exchange rate	(7.10%)
Euro
Real Estate Properties
Foreign currency exchange rate	1.1198	1.1234
Increase (decrease) in foreign currency exchange rate	(0.30%)
Norwegian Krone
Real Estate Properties
Foreign currency exchange rate	0.1026	0.1139
Increase (decrease) in foreign currency exchange rate	(9.90%)