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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
SHARE-BASED COMPENSATION                      
Net income $ 12,208 $ 11,466 $ 12,137 $ 11,181 $ 10,932 $ 12,206 $ 12,335 $ 10,395 $ 46,992 $ 45,868 $ 40,453
Weighted average shares outstanding - basic (in shares)                 31,009,000 32,238,000 37,366,000
Weighted average shares outstanding - diluted (in shares)                 31,225,000 32,651,000 37,937,000
Basic earnings per share (in dollars per share) $ 0.40 $ 0.37 $ 0.39 $ 0.36 $ 0.35 $ 0.39 $ 0.39 $ 0.30 $ 1.52 $ 1.42 $ 1.08
Diluted earnings per share (in dollars per share) $ 0.39 $ 0.37 $ 0.39 $ 0.35 $ 0.34 $ 0.38 $ 0.39 $ 0.29 $ 1.50 $ 1.40 $ 1.07
Antidilutive securities excluded from the dilutive share calculation (in shares)                 1,892 8,217 13,510
Stock Option                      
SHARE-BASED COMPENSATION                      
Dilutive effect of share-based compensation arrangements (in shares)                 216,000 413,000 571,000