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Stock-Based Compensation (Summary of Compensation Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense $ 2,146 $ 2,601 $ 1,822
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense 3,006 2,903 2,739
Restricted Stock | Advisory Services Fee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense 2,672 2,468 2,277
Restricted Stock | Management fees      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense 133 155 219
Restricted Stock | Corporate General and Administrative | Premier      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense 71 72 0
Restricted Stock | Corporate General and Administrative | Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense 130 208 243
Performance Shares | Advisory Services Fee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense $ 2,695 $ 2,439 $ 2,443