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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SHARE-BASED COMPENSATION
Net income	$ 15,792	$ 15,193	$ 14,224	$ 14,277	$ 4,288	$ 11,812	$ 12,025	$ 13,079	$ 59,486	$ 41,204	$ 46,992
Weighted average shares outstanding - basic (in shares)									29,409,683	30,400,511	31,008,744
Weighted average shares outstanding - diluted (in shares)									29,609,907	30,638,140	31,224,894
Basic earnings per share (in dollars per share)	$ 0.54	$ 0.52	$ 0.48	$ 0.48	$ 0.14	$ 0.39	$ 0.39	$ 0.43	$ 2.02	$ 1.36	$ 1.52
Diluted earnings per share (in dollars per share)	$ 0.54	$ 0.52	$ 0.48	$ 0.48	$ 0.14	$ 0.39	$ 0.39	$ 0.42	$ 2.01	$ 1.34	$ 1.50
Antidilutive securities excluded from the dilutive share calculation (in shares)									0	0	1,892
Stock Option
SHARE-BASED COMPENSATION
Dilutive effect of share-based compensation arrangements (in shares)									200,224	237,629	216,150

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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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