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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
SHARE-BASED COMPENSATION
Net income	$ 11,812	$ 11,466	$ 36,916	$ 34,784
Weighted average shares outstanding - basic	30,300,195	30,943,756	30,526,260	31,088,729
Weighted average shares outstanding - diluted	30,514,459	31,142,128	30,758,989	31,277,402
Basic earnings per common share (in dollars per share)	$ 0.39	$ 0.37	$ 1.21	$ 1.12
Diluted earnings per common share (in dollars per share)	$ 0.39	$ 0.37	$ 1.20	$ 1.11
Antidilutive securities excluded from the dilutive share calculation (in shares)	80	8,902	8	9,381
Stock Option
SHARE-BASED COMPENSATION
Dilutive effect of share-based compensation arrangements	214,264	198,372	232,729	188,673

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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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