EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
SHARE-BASED COMPENSATION
Net income	$ 11,181	$ 10,395
Weighted average shares outstanding - basic	31,263,433	34,827,141
Weighted average shares outstanding - diluted	31,506,307	35,478,629
Basic earnings per share (in dollars per share)	$ 0.36	$ 0.30
Diluted earnings per share (in dollars per share)	$ 0.35	$ 0.29
Antidilutive securities excluded from the dilutive share calculation (in shares)	28,135	13,472
Stock Option
SHARE-BASED COMPENSATION
Dilutive effect of share-based compensation arrangements	242,874	651,488

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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