EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Calculation of basic and diluted earnings per common share from continuing operations
Earnings (loss) from continuing operations	$ 149,568	$ (73,705)	$ 201,152	$ (182,834)
Less: Distributed and undistributed earnings allocated to unvested stock	(703)	(130)	(940)	(248)
Earnings (loss) from continuing operations available to common shareholders	$ 148,865	$ (73,835)	$ 200,212	$ (183,082)
Weighted average common shares outstanding - Basic (in shares)	52,378	52,355	52,333	52,320
Effect of dilutive equity awards (in shares)	1,213	0	1,039	0
Weighted average common shares outstanding — Diluted (in shares)	53,591	52,355	53,372	52,320
Earnings (loss) from continuing operations per common share — Basic (in dollars per share)	$ 2.84	$ (1.41)	$ 3.83	$ (3.50)
Earnings (loss) from continuing operations per common share - Diluted (in dollars per share)	$ 2.78	$ (1.41)	$ 3.75	$ (3.50)
Anti-dilutive equity awards not included in diluted EPS (in shares)	417	3,612	958	3,498