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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Numerator for basic and diluted earnings per share:    
Net income $ 4,011 $ 6,653
Less net income attributable to non-controlling interests (40) (802)
Less earnings allocated to unvested restricted stock (311) (293)
Net income available for common stockholders: basic and diluted $ 3,660 $ 5,558
Denominator for basic earnings per share:    
Weighted average number of common shares 18,894,000 18,396,000
Effect of diluted securities:    
RSUs 99,000 38,000
Denominator for diluted earnings per share:    
Weighted average number of shares 18,993,000 18,434,000
Earnings per common share, basic (in dollars per share) $ 0.19 $ 0.30
Earnings per common share, diluted (in dollars per share) $ 0.19 $ 0.30
2016 Incentive Plan    
Earnings Per Common Share    
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric 64,955 37,612
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric 76,250  
Effect of diluted securities:    
RSUs 141,205 37,612
2016 Incentive Plan | September 26, 2017    
Earnings Per Common Share    
Number of underlying shares 76,250 76,250
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric 33,611 37,612
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric 38,125  
Number of remaining shares at the respective measurement dates 4,514 38,638
Effect of diluted securities:    
RSUs 71,736 37,612
2016 Incentive Plan | July 1, 2018    
Earnings Per Common Share    
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric 31,344  
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric 38,125  
Number of remaining shares at the respective measurement dates 6,781  
Effect of diluted securities:    
RSUs 69,469