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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator for basic and diluted earnings per share:
Net income, basic	$ 148,157	$ 67,075	$ 193,471	$ 88,811
Net income, diluted	$ 148,157	$ 67,075	$ 193,471	$ 88,811
Denominator:
Weighted-average basic shares outstanding (in shares)	54,318	54,529	54,362	54,625
Dilutive effect of outstanding stock awards (in shares)	279	325	277	320
Dilutive shares outstanding (in shares)	54,597	54,854	54,639	54,945
Basic earnings per share (in dollars per share)	$ 2.73	$ 1.23	$ 3.56	$ 1.63
Diluted earnings per share (in dollars per share)	$ 2.71	$ 1.22	$ 3.54	$ 1.62