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Stock-Based Compensation (Summary of Compensation Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense $ 3,313 $ 2,146 $ 2,601
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense 3,517 3,006 2,903
Restricted Stock | Advisory Services Fee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense 3,028 2,672 2,468
Restricted Stock | Management fees      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense 56 133 155
Restricted Stock | Corporate General and Administrative      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense 111 71 72
Restricted Stock | Corporate General and Administrative | Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense 322 130 208
Performance Shares | Advisory Services Fee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense $ 3,374 $ 2,695 $ 2,439