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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]                      
Income (Loss) from Continuing Operations Attributable to Parent $ 22,661 $ 3,038 $ 4,410 $ 7,084 $ 4,127 $ 5,683 $ 5,200 $ 4,571 $ 37,193 $ 19,581 $ 20,853
Earnings Allocated to Unvested Restricted Stock                 (135) (89) (257)
Income from Continuing Operations Less Earnings Allocated to Unvested Restricted Stock                 $ 37,058 $ 19,492 $ 20,596
Weighted Average Number of Shares Outstanding, Basic                 16,438 16,515 17,791
Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units                 $ 336 $ 454 $ 246
Incremental common shares attributable to dilutive effect of conversion of debt securities                 941 491 276
Weighted average number of common and common equivalent shares outstanding for diluted EPS computation                 17,715 17,460 18,313
Basic earnings per common share (in dollars per share) $ 1.41 $ 0.18 $ 0.26 $ 0.42 $ 0.25 $ 0.34 $ 0.31 $ 0.27 $ 2.25 $ 1.18 $ 1.16
Diluted earnings per common share (in dollars per share) $ 1.31 $ 0.17 $ 0.24 $ 0.39 $ 0.22 $ 0.33 $ 0.30 $ 0.27 $ 2.09 $ 1.12 $ 1.12