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Earnings per Share & Stock Compensation - Basic and Diluted 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
Share-based Payment Arrangement [Abstract]                      
Income from continuing operations $ 1,600 $ 1,412 $ (536) $ 150 $ (896) $ 1,168 $ 1,509 $ 607 $ 2,626 $ 2,388 $ 2,077
Income from discontinued operations, net of tax 47,675 33,509 29,784 13,129 15,439 13,186 11,640 13,303 124,097 53,568 44,518
Net income $ 49,275 $ 34,921 $ 29,248 $ 13,279 $ 14,543 $ 14,354 $ 13,149 $ 13,910 $ 126,723 $ 55,956 $ 46,595
Basic weighted average shares outstanding (in shares)                 49,901 49,811 49,542
Basic - Income from continuing operations (in dollars per share) $ 0.03 $ 0.03 $ (0.01) $ 0 $ (0.01) $ 0.02 $ 0.03 $ 0.01 $ 0.05 $ 0.05 $ 0.04
Basic - Income from discontinued operations, net of tax (in dollars per share) 0.96 0.67 0.59 0.27 0.30 0.27 0.23 0.27 2.49 1.07 0.90
Basic net income per share (in dollars per share) 0.99 0.70 0.58 0.27 0.29 0.29 0.26 0.28 $ 2.54 $ 1.12 $ 0.94
Effect from dilutive shares and options outstanding (in shares)                 123 290 521
Weighted average shares outstanding, diluted (in shares)                 50,024 50,101 50,063
Diluted - Income from continuing operations (in dollars per share) 0.03 0.03 (0.01) 0 (0.01) 0.02 0.03 0.01 $ 0.05 $ 0.05 $ 0.04
Diluted - Income from discontinued operations, net of tax (in dollars per share) 0.95 0.67 0.59 0.27 0.30 0.27 0.23 0.27 2.48 1.07 0.89
Diluted net income per share (in dollars per share) $ 0.98 $ 0.70 $ 0.58 $ 0.27 $ 0.29 $ 0.29 $ 0.26 $ 0.28 $ 2.53 $ 1.12 $ 0.93