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Earnings Per Share Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]                      
Income (Loss) from Continuing Operations Attributable to Parent $ 8,365 $ 5,525 $ 6,397 $ (4,197) $ 2,569 $ 577 $ 4,862 $ 6,525 $ 16,090 $ 14,533 $ 11,645
Earnings Allocated to Unvested Restricted Stock                 (46) (62) (57)
Income from Continuing Operations Less Earnings Allocated to Unvested Restricted Stock                 $ 16,044 $ 14,471 $ 11,588
Weighted Average Number of Shares Outstanding, Basic                 17,872 17,877 17,971
Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units                 $ 196 $ 118 $ 66
Incremental common shares attributable to dilutive effect of conversion of debt securities                 9 10 337
Weighted average number of common and common equivalent shares outstanding for diluted EPS computation                 18,077 18,005 18,374
Basic earnings per common share (in dollars per share) $ 0.47 $ 0.31 $ 0.36 $ (0.23) $ 0.14 $ 0.03 $ 0.27 $ 0.36 $ 0.90 $ 0.81 $ 0.64
Diluted earnings per common share (in dollars per share) $ 0.46 $ 0.31 $ 0.36 $ (0.23) $ 0.14 $ 0.03 $ 0.27 $ 0.36 $ 0.89 $ 0.80 $ 0.63