EARNINGS PER SHARE (Reconciliation of Basic and Diluted Earnings Per Share Computations) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator for basic and diluted earnings per share:
Net income	$ 21,736	$ 11,572
Denominator:
Basic shares outstanding (in shares)	54,723	55,757
Dilutive effect of outstanding stock awards (in shares)	320	298
Dilutive shares outstanding (in shares)	55,043	56,055
Basic earnings per share (in dollars per share)	$ 0.40	$ 0.21
Diluted earnings per share (in dollars per share)	$ 0.39	$ 0.21