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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense $ 2,601 $ 1,822 $ (1,161)
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unamortized cost $ 4,200    
Unamortized cost, period of recognition 2 years 2 months 12 days    
Weighted average period for recognition 1 year 8 months 12 days    
Allocated compensation expense $ 2,903 $ 2,739 $ 1,209
Number of Units      
Outstanding at beginning of year (in shares) 441,000 420,000 360,000
Granted (in shares) 261,000 257,000 198,000
Vested (in shares) (198,000) (229,000) (131,000)
Forfeited (in shares) (7,000) (7,000) (7,000)
Outstanding at end of year (in shares) 497,000 441,000 420,000
Weighted Average Price at Grant      
Outstanding at beginning of year (in dollars per share) $ 10.91 $ 11.87 $ 12.90
Granted (in dollars per share) 12.68 9.90 10.78
Vested (in dollars per share) 10.75 11.54 13.05
Forfeited (in dollars per share) 11.59 10.50 11.81
Outstanding at end of year (in dollars per share) $ 11.89 $ 10.91 $ 11.87
Restricted Stock | Executive Officer      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense   $ 640  
Restricted Stock | Advisory Services Fee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense $ 2,468 2,277 $ 916
Restricted Stock | Management fees      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense 155 219 92
Restricted Stock | Corporate General and Administrative Expense | Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense 208 243 201
Restricted Stock | Corporate General and Administrative Expense | Premier      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense 72 $ 0 $ 0
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unamortized cost $ 4,000    
Unamortized cost, period of recognition 2 years    
Weighted average period for recognition 1 year 7 months 6 days    
Number of Units      
Outstanding at beginning of year (in shares) 316,000 381,000 417,000
Granted (in shares) 223,000 197,000 119,000
Forfeited (in shares) (119,000) (262,000) (155,000)
Outstanding at end of year (in shares) 420,000 316,000 381,000
Weighted Average Price at Grant      
Outstanding at beginning of year (in dollars per share) $ 12.29 $ 11.97 $ 14.80
Granted (in dollars per share) 19.96 13.43 10.42
Forfeited (in dollars per share) 10.42 12.67 18.40
Outstanding at end of year (in dollars per share) $ 16.91 $ 12.29 $ 11.97
Service period 3 years    
Performance Shares | Minimum      
Weighted Average Price at Grant      
Award performance target 0.00%    
Performance Shares | Maximum      
Weighted Average Price at Grant      
Award performance target 200.00%    
Performance Shares | Executive Officer      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense   $ 1,600  
Performance Shares | Advisory Services Fee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated compensation expense $ 2,439 $ 2,443 $ (1,375)
Equity Incentive Plan 2013      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized to grant (in shares) 3,300,000    
Shares available for future issuance (in shares) 823,983