Summary of Significant Accounting Policies - Foreign Currencies (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
British Pound Sterling
Real Estate Properties
Foreign currency exchange rate	1.3479	1.3649
Increase (decrease) in foreign currency exchange rate	(1.20%)
EUR
Real Estate Properties
Foreign currency exchange rate	1.1326	1.2271
Increase (decrease) in foreign currency exchange rate	(7.70%)
NOK
Real Estate Properties
Foreign currency exchange rate	0.1134	0.1172
Increase (decrease) in foreign currency exchange rate	(3.30%)