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Quarterly Financial Data (Unaudited) Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 65,076 | $ 61,054 | $ 63,852 | $ 68,157 | $ 62,864 | $ 60,140 | $ 61,865 | $ 63,331 | $ 258,139 | $ 248,200 | $ 242,502
Gross profit | 19,560 | 15,480 | 18,667 | 23,092 | 21,312 | 18,228 | 18,807 | 21,303 | 76,799 | 79,650 | 77,508
Net income from continuing operations | $ 22,661 | $ 3,038 | $ 4,410 | $ 7,084 | $ 4,127 | $ 5,683 | $ 5,200 | $ 4,571 | $ 37,193 | $ 19,581 | $ 20,853
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

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