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Stock Compensation and Other Benefit Plans for ROIC (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2009
shares
Apr. 25, 2018
shares
Stock Compensation and Other Benefit Plans for ROIC (Details) [Line Items]          
Compensation expense | $ $ 7,400 $ 6,200 $ 4,900    
Employer discretionary contribution amount | $ $ 86 70 76    
2009 Equity Incentive Plan [Member]          
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 [Member]          
Stock Compensation and Other Benefit Plans for ROIC (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, 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]          
Grants in period (in shares) | shares 514,972.00        
Restricted Stock | 2009 Equity Incentive Plan [Member]          
Stock Compensation and Other Benefit Plans for ROIC (Details) [Line Items]          
Compensation cost not yet recognized | $ $ 7,500        
Compensation cost not yet recognized, period for recognition (in years) 1 year 255 days        
Vested in period, fair value | $ $ 5,500 $ 6,300 $ 5,600    
Restricted stock awards – performance-based | Vesting on January 1, 2021          
Stock Compensation and Other Benefit Plans for ROIC (Details) [Line Items]          
Grants in period (in shares) | shares 180,200