Annual report pursuant to Section 13 and 15(d)

NET INCOME PER COMMON SHARE (Details)

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NET INCOME PER COMMON SHARE (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
NET INCOME PER COMMON SHARE [Abstract]                      
Net income                 $ 18,598 $ 15,571 $ 19,498
Basic earnings per common share [Abstract]                      
Weighted average shares outstanding (in shares)                 24,370,000 24,188,000 24,115,000
Per share amount (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 earnings per common share [Abstract]                      
Weighted average shares outstanding (in shares)                 25,181,000 24,896,000 24,745,000
Per share amount (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
Weighted average shares-denominator basic computation (in shares)                 24,370,000 24,188,000 24,115,000
Unvested restricted stock grant (in shares)                 141,000 0 0
Effect of dilutive stock options (in shares)                 670,000 708,000 630,000
Weighted average shares, as adjusted denominator diluted computation (in shares)                 25,181,000 24,896,000 24,745,000
Potential common stock shares issuable upon exercise of options (in shares)                 1,376,437 1,598,191 1,326,360
Treasury of TOCCO included in earnings per share calculation (in shares)                 300,000 300,000 300,000