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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SHARE-BASED COMPENSATION                      
Net income $ 4,288 $ 11,812 $ 12,025 $ 13,079 $ 12,208 $ 11,466 $ 12,137 $ 11,181 $ 41,204 $ 46,992 $ 45,868
Weighted average shares outstanding - basic (in shares)                 30,401,000 31,009,000 32,238,000
Weighted average shares outstanding - diluted (in shares)                 30,638,000 31,225,000 32,651,000
Basic earnings per share (in dollars per share) $ 0.14 $ 0.39 $ 0.39 $ 0.43 $ 0.40 $ 0.37 $ 0.39 $ 0.36 $ 1.36 $ 1.52 $ 1.42
Diluted earnings per share (in dollars per share) $ 0.14 $ 0.39 $ 0.39 $ 0.42 $ 0.39 $ 0.37 $ 0.39 $ 0.35 $ 1.34 $ 1.50 $ 1.40
Antidilutive securities excluded from the dilutive share calculation (in shares)                 0 1,892 8,217
Stock Option                      
SHARE-BASED COMPENSATION                      
Dilutive effect of share-based compensation arrangements (in shares)                 238,000 216,000 413,000