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 ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly results of operations [Abstract]                      
Revenues $ 60,545 $ 66,938 $ 59,350 $ 55,143 $ 74,073 $ 76,917 $ 74,553 $ 64,100 $ 241,976 $ 289,643 $ 236,227
Gross profit 11,847 16,625 15,184 15,713 12,285 13,044 11,700 8,714 59,369 45,743 35,163
Net income $ 1,122 $ 5,318 $ 6,374 $ 5,784 $ 2,198 $ 5,774 $ 5,000 $ 2,599 $ 18,598 $ 15,571 $ 19,498
Basic EPS (in dollars per share) $ 0.05 $ 0.21 $ 0.26 $ 0.24 $ 0.09 $ 0.24 $ 0.20 $ 0.11 $ 0.76 $ 0.64 $ 0.81
Diluted EPS (in dollars per share) $ 0.05 $ 0.21 $ 0.25 $ 0.23 $ 0.09 $ 0.23 $ 0.20 $ 0.11 $ 0.74 $ 0.63 $ 0.79