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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net income (loss)	$ 55,562	$ 71,480
Denominator (shares in 000's):
Basic weighted average shares outstanding (in shares)	60,184,000	63,160,000
Effect of dilutive securities - Stock options and awards (in shares)	615,000	739,000
Diluted weighted average shares outstanding (in shares)	60,799,000	63,899,000
Earnings (loss) per share
Basic earnings per share (Note 3)	$ 0.92	$ 1.13
Diluted earnings per share (Note 3)	$ 0.91	$ 1.12
Anti-dilutive shares excluded from the computation of diluted earnings per share	655,764	498,694

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