NET EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share, Basic and Diluted [Abstract]
Net Earnings - Basic and Diluted	$ 23,411	$ 19,768
Weighted average common shares - basic (in shares)	32,255,000	32,135,000
Effect of dilutive securities - stock options, restricted stock, and performance shares (in shares)	402,000	382,000
Weighted average common shares - diluted (in shares)	32,657,000	32,517,000
Net earnings per share - basic (in dollars per share)	$ 0.73	$ 0.62
Net earnings per share - diluted (in dollars per share)	$ 0.72	$ 0.61
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)	311,030	212,551