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Stock Compensation and Other Benefit Plans for ROIC (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Nonvested Restricted Stock Units Activity
 
Shares
 
Weighted Average
Grant Date Fair Value
Non-vested at December 31, 2016
660,458

 
$
16.10

Granted
419,394

 
$
19.58

Vested
(296,386
)
 
$
15.61

Forfeited
(1,999
)
 
$
19.66

Non-vested at December 31, 2017
781,467

 
$
18.14