Unaudited Quarterly Financial Information (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
adjustment
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Unaudited Quarterly Financial Information                      
Revenues $ 108,301,000 $ 84,594,000 $ 67,852,000 $ 63,510,000 $ 75,181,000 $ 55,626,000 $ 58,190,000 $ 52,331,000 $ 324,257,000 $ 241,328,000 $ 182,713,000
Gross profit 76,345,000 56,302,000 44,917,000 41,996,000 52,609,000 38,678,000 41,192,000 35,619,000      
Acquisition and integration 1,343,000 10,571,000 3,195,000 10,000 169,000 100,000     15,119,000 269,000  
Income (Loss) from continuing operations (a) 5,848,000 (2,697,000) 10,498,000 12,888,000 18,554,000 10,040,000 8,830,000 7,878,000 26,537,000 45,302,000 19,924,000
Income (Loss)from discontinued operations (b) (1,425,000) (134,000) (285,000) (209,000) (3,927,000) (140,000) 170,000 164,000 (2,053,000) (3,733,000) 577,000
Net income (loss) (a) 4,423,000 (2,831,000) 10,213,000 12,679,000 14,627,000 9,900,000 9,000,000 8,042,000 24,484,000 41,569,000 20,501,000
Basic income (loss) per common share:                      
Continuing (in dollars per share) $ 0.21 $ (0.10) $ 0.38 $ 0.46 $ 0.66 $ 0.35 $ 0.31 $ 0.32 $ 0.96 $ 1.65 $ 0.87
Discontinued (in dollars per share) $ (0.05)   $ (0.01) $ (0.01) $ (0.14)   $ 0.01 $ 0.01 $ (0.07) $ (0.13) $ 0.03
Total (in dollars per share) $ 0.16 $ (0.10) $ 0.37 $ 0.45 $ 0.52 $ 0.35 $ 0.32 $ 0.33 $ 0.89 $ 1.52 $ 0.90
Diluted income (loss) per common share:                      
Continuing (in dollars per share) $ 0.21 $ (0.10) $ 0.38 $ 0.46 $ 0.65 $ 0.35 $ 0.31 $ 0.31 $ 0.95 $ 1.63 $ 0.85
Discontinued (in dollars per share) $ (0.05)   $ (0.01) $ (0.01) $ (0.14) $ (0.01) $ 0.01 $ 0.01 $ (0.07) $ (0.13) $ 0.03
Total (in dollars per share) $ 0.16 $ (0.10) $ 0.37 $ 0.45 $ 0.51 $ 0.34 $ 0.32 $ 0.32 $ 0.88 $ 1.50 $ 0.88
Decrease in amortization of intangible assets   2,200,000                  
Increase in general and administrative expense related to stock based compensation   500,000                  
Number of adjustments effecting net income   2                  
Increase in income tax effect on general and administrative expense related to stock based compensation   500,000                  
Increase in net income   1,200,000                  
Impairment of Springbox unit 1,800,000       5,900,000       1,800,000 5,866,000  
Credit for reversal of an earnout liability related to Match Point $ 900,000