EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
SHARE-BASED COMPENSATION
Net income	$ 13,079	$ 11,181
Weighted average shares outstanding - basic	30,714,895	31,263,433
Weighted average shares outstanding - diluted	31,001,238	31,506,307
Basic earnings per common share (in dollars per share)	$ 0.43	$ 0.36
Diluted earnings per common share (in dollars per share)	$ 0.42	$ 0.35
Antidilutive securities excluded from the dilutive share calculation (in shares)	539	28,135
Stock Option
SHARE-BASED COMPENSATION
Dilutive effect of share-based compensation arrangements	286,343	242,874

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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