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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income	$ 13,766	$ 18,226	$ 11,300	$ 13,117	$ 43,292	$ 34,134
Denominator:
Denominator for basic earnings per share	26,716			26,802	26,745	26,754
Dilutive effect of employee stock awards	186			97	138	132
Denominator for diluted earnings per share	26,902			26,899	26,883	26,886
Earnings per share:
Basic	$ 0.52			$ 0.49	$ 1.62	$ 1.28
Diluted	$ 0.51			$ 0.49	$ 1.61	$ 1.27
Additional Disclosure
Employee stock awards excluded from computation of diluted earnings per share	0			0	0	0

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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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