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Stock Compensation and Other Benefit Plans for ROIC (Narrative) (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2009
shares
Apr. 25, 2018
shares
Stock Compensation and Other Benefit Plans for ROIC (Details) [Line Items]          
Exercises in period (in shares) | shares 186,000        
Exercises in period (in dollars per share) | $ / shares $ 10.44        
Intrinsic value for exercises in period $ 1,400        
Share-based compensation expense 8,600 $ 7,400 $ 6,200    
Employer discretionary contribution amount $ 87 86 70    
2009 Equity Incentive Plan          
Stock Compensation and Other Benefit Plans for ROIC (Details) [Line Items]          
Percentage of outstanding stock maximum (in percentage)       7.50%  
Maximum number of shares (in shares) | shares       4,000,000  
Equity Incentive Plan          
Stock Compensation and Other Benefit Plans for ROIC (Details) [Line Items]          
Number of shares authorized | shares         22,500,000
Fungible Unit to full value award conversion ratio         6.25
Restricted Stock          
Stock Compensation and Other Benefit Plans for ROIC (Details) [Line Items]          
Granted (in shares) | shares 354,161        
Granted (in dollars per share) | $ / shares $ 17.20        
Compensation cost not yet recognized $ 6,100        
Compensation cost not yet recognized, period for recognition (in years) 1 year 7 months 6 days        
Vested in period, fair value $ 5,800 $ 5,500 $ 6,300    
LTIP Units          
Stock Compensation and Other Benefit Plans for ROIC (Details) [Line Items]          
Granted (in dollars per share) | $ / shares $ 16.27        
Compensation cost not yet recognized $ 2,400        
Compensation cost not yet recognized, period for recognition (in years) 2 years        
LTIP Units | Vesting on January 1, 2022          
Stock Compensation and Other Benefit Plans for ROIC (Details) [Line Items]          
Granted (in shares) | shares 187,279