Annual report pursuant to Section 13 and 15(d)

Leases (Percentage of Revenue) (Details)

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Leases (Percentage of Revenue) (Details) - United States Government - Concentration risk
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Lease Revenue From Continuing Operations, Risk Benchmark      
Concentration Risk [Line Items]      
Percentage of revenue 36.00% 37.00% 37.00%
Fixed Lease Revenue From Continuing Operations Benchmark      
Concentration Risk [Line Items]      
Percentage of revenue 26.00% 27.00% 27.00%