NET EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share, Basic and Diluted [Abstract]
Net Earnings - Basic and Diluted	$ 19,768	$ 18,783
Weighted average common shares - basic (in shares)	32,135,000	32,188,000
Effect of dilutive securities - stock options, restricted stock, and performance shares (in shares)	382,000	321,000
Weighted average common shares - diluted (in shares)	32,517,000	32,509,000
Net earnings per share - basic (in dollars per share)	$ 0.62	$ 0.58
Net earnings per share - diluted (in dollars per share)	$ 0.61	$ 0.58
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive stock options outstanding, excluded from diluted earnings per share calculation (in shares)	212,551	515,573

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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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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