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Earnings Per Share (EPS Computations) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Apr. 01, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Less: Loss (earnings) allocated to unvested restricted stock $ (6,167) $ 6,397 $ 6,766 $ 2,200  
Income (loss) attributable to common stockholders 8 (18) (13) (8)  
Income (loss) attributable to common stockholders $ (6,159) $ 6,379 $ 6,753 $ 2,192  
Denominator [Abstract]          
Denominator for basic earnings per common share - weighted average shares outstanding 17,967,000 17,860,000 17,966,000 17,833,000  
Weighted average number of common and common equivalent shares outstanding for diluted EPS computation 18,511,000 17,889,000 18,364,000 17,862,000  
Basic and Diluted earnings per common share:          
Continuing operations (in dollars per Share) $ (0.34) $ 0.36 $ 0.38 $ 0.12  
Continuing operations (in dollars per Share) $ (0.33) $ 0.36 $ 0.37 $ 0.12  
Share price (in USD per share)         $ 35.80
Stock options          
Denominator [Abstract]          
Effect of dilutive securities, share options (in shares) 213,000 29,000 232,000 29,000  
Basic and Diluted earnings per common share:          
Antidilutive securities excluded from computation of diluted EPS 0 1,017,383   1,025,734  
Performance awards          
Denominator [Abstract]          
Effect of dilutive securities, share options (in shares) 331,000 0 166,000 0