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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
SHARE-BASED COMPENSATION
Net income	$ 12,025	$ 12,137	$ 25,104	$ 23,318
Weighted average shares outstanding - basic	30,568,247	31,060,593	30,641,165	31,162,013
Weighted average shares outstanding - diluted	30,803,725	31,262,525	30,879,923	31,359,568
Basic earnings per common share (in dollars per share)	$ 0.39	$ 0.39	$ 0.82	$ 0.75
Diluted earnings per common share (in dollars per share)	$ 0.39	$ 0.39	$ 0.81	$ 0.74
Antidilutive securities excluded from the dilutive share calculation (in shares)	33	8,227	25	9,439
Stock Option
SHARE-BASED COMPENSATION
Dilutive effect of share-based compensation arrangements	235,478	201,932	238,758	197,555

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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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