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Selected Quarterly Financial Data (unaudited) (Quarterly Financial Information) (Details) - USD ($)
$ / shares in Units, $ 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
Selected Quarterly Financial Data (unaudited) [Abstract]                      
Revenue $ 78,007 $ 77,205 $ 75,729 $ 70,622 $ 62,467 $ 68,578 $ 71,144 $ 72,345 $ 301,563 $ 274,534 $ 272,773
Gross profit 59,126 58,183 57,611 52,892 47,082 52,163 53,225 53,194 227,812 205,664 201,315
Income from continuing operations before income taxes 9,796 10,371 11,448 8,711 6,660 9,011 5,092 6,359 40,326 27,122 29,671
Income from continuing operations                 27,721 17,835 19,567
Net income $ 7,306 $ 6,686 $ 7,584 $ 6,145 $ 4,113 $ 6,065 $ 3,397 $ 4,260 $ 27,721 $ 17,835 $ 20,058
Earnings per share - basic $ 0.61 $ 0.56 $ 0.64 $ 0.52 $ 0.35 $ 0.51 $ 0.29 $ 0.36 $ 2.32 $ 1.51 $ 1.68
Earnings per share - diluted $ 0.60 $ 0.55 $ 0.63 $ 0.51 $ 0.34 $ 0.51 $ 0.29 $ 0.36 $ 2.29 $ 1.49 $ 1.66