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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2017
Jun. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2010
Numerator for basic and diluted earnings per share:              
Net income     $ 10,182 $ 7,128 $ 21,381 $ 20,007  
Less net income attributable to non-controlling interests     (35) (23) (866) (65)  
Less earnings allocated to unvested restricted stock     (342) (263) (879) (796)  
Net income available for common stockholders: basic and diluted     $ 9,805 $ 6,842 $ 19,636 $ 19,146  
Denominator for basic earnings per share:              
Weighted average number of common shares     18,646,000 18,000,000 18,521,000 17,859,000  
Effect of dilutive securities:              
RSUs     59,000 79,000 41,000 102,000  
Denominator for diluted earnings per share: weighted average number of shares     18,705,000 18,079,000 18,562,000 17,961,000  
Earnings per common share, basic     $ 0.53 $ 0.38 $ 1.06 $ 1.07  
Earnings per common share, diluted     $ 0.52 $ 0.38 $ 1.06 $ 1.07  
RSUs              
Earnings Per Common Share              
Number of shares granted     76,250 76,250 76,250 76,250  
Number of shares vested           113,584  
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     64,453 38,125 64,453 38,125  
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric     38,125   38,125    
Effect of dilutive securities:              
RSUs     102,578 38,125 102,578 38,125  
2016 Incentive Plan | September 26, 2017              
Earnings Per Common Share              
Number of shares included in diluted weighted average number of shares pursuant to return on capital performance metric     33,524 38,125 33,524 38,125  
Number of shares in diluted weighted average number of shares pursuant to stockholder return metric     38,125   38,125    
Common Shares not included Attributable To Share Based Payment Arrangements Due To Applicable Return On Metric         4,601 38,125  
Effect of dilutive securities:              
RSUs     71,649 38,125 71,649 38,125  
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     30,929   30,929    
Common Shares not included Attributable To Share Based Payment Arrangements Due To Applicable Return On Metric         45,321    
Effect of dilutive securities:              
RSUs     30,929   30,929    
2009 Incentive Plan | RSUs              
Earnings Per Common Share              
Number of shares granted             200,000
Number of shares vested   113,584          
Number of shares issued 113,584