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Stockholders' Equity and Non-controlling Interests - Issuance of shares (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
shares
Shareholders' Equity        
Shares issued 29,952,608 30,594,592    
Restricted Stock Awards        
Shareholders' Equity        
Unvested restricted shares outstanding 345,000 299,000 277,000 189,000
Operating Partnership | Common Units        
Shareholders' Equity        
Parent ownership interest (as a percent) 94.00%      
Operating Partnership | Operating Partnership        
Shareholders' Equity        
Parent ownership interest (as a percent) 94.00%      
Non-controlling Interest in Operating Partnership        
Shareholders' Equity        
Increase (decrease) to non-controlling interest in the Operating Partnership | $ $ 68 $ (443) $ 2,692  
Pittman Hough Farms | Operating Partnership | Common Units        
Shareholders' Equity        
Noncontrolling ownership interest (as a percent) 6.00%      
Ratio for conversion into common shares 1      
Redeemable Common Units | Common Units        
Shareholders' Equity        
OP units outstanding for redemption 1,900,000 4,600,000