Capital Stock and Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net income	$ 650,024	$ 1,298	$ 423,635
Denominator:
Basic weighted-average shares outstanding (in shares)	153,747	153,186	157,054
Effect of dilutive securities – employee stock compensation plan (in shares)	1,233	722	750
Diluted weighted-average shares outstanding (in shares)	154,980	153,908	157,804
Basic (in dollars per share)	$ 4.23	$ 0.01	$ 2.70
Diluted (in dollars per share)	$ 4.19	$ 0.01	$ 2.68