Annual report pursuant to section 13 and 15(d)

QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details)

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QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly results of operations [Abstract]                      
Revenues $ 66,637 $ 60,870 $ 55,975 $ 52,745 $ 49,936 $ 54,278 $ 61,849 $ 56,795 $ 236,227 $ 222,858 $ 199,517
Gross profit 9,819 10,098 8,567 6,679 6,906 8,767 8,367 6,718 35,163 30,758 25,917
Net income $ 3,182 $ 5,221 $ 6,309 $ 4,786 $ 1,850 $ 3,004 $ 3,472 $ 1,995 $ 19,498 $ 10,321 $ 13,884
Basic EPS (in dollars per share) $ 0.13 $ 0.22 $ 0.26 $ 0.20 $ 0.08 $ 0.13 $ 0.14 $ 0.08 $ 0.81 $ 0.43 $ 0.58
Diluted EPS (in dollars per share) $ 0.13 $ 0.21 $ 0.26 $ 0.19 $ 0.08 $ 0.12 $ 0.14 $ 0.08 $ 0.79 $ 0.42 $ 0.57