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Quarterly Financial Data (Unaudited) Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 61,610 | $ 59,419 | $ 58,378 | $ 59,261 | $ 63,253 | $ 54,549 | $ 56,504 | $ 55,652 | $ 242,502 | $ 226,124 | $ 213,074
Gross profit | 19,691 | 18,927 | 17,360 | 18,248 | 22,209 | 15,077 | 17,989 | 18,015 | 77,508 | 70,008 | 64,285
Net income from continuing operations | 5,434 | 5,367 | 4,444 | 4,557 | 6,418 | 4,565 | 3,883 | 1,631 | 20,853 | 15,446 | 15,120
Income from discontinued operations, net of tax |  | 11 |  |  |  | 431 | (637) | 587 | 0 | 392 | 4,176
Preferred stock dividend |  |  |  |  |  |  |  |  | 0 | 0 | (4)
Net income | $ 5,434 | $ 5,378 | $ 4,444 | $ 4,557 | $ 6,418 | $ 4,996 | $ 3,246 | $ 2,218 | $ 20,853 | $ 15,838 | $ 19,292
Basic earnings per common share (in dollars per share) | $ 0.32 | $ 0.29 | $ 0.25 | $ 0.25 | $ 0.35 | $ 0.27 | $ 0.18 | $ 0.12 | $ 1.16 | $ 0.86 | $ 1.06
Diluted earnings per common share (in dollars per share) | $ 0.31 | $ 0.29 | $ 0.24 | $ 0.24 | $ 0.34 | $ 0.26 | $ 0.17 | $ 0.12 | $ 1.12 | $ 0.85 | $ 1.00

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