Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2023

Earnings Per Share [Abstract]

Schedule of earnings per share

A reconciliation of the numerators and denominators used for the basic and diluted net income per share computations is as follows (in thousands of dollars):

	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
Numerator:
Net income	$	150,064	$	68,458	$	404,057	$	77,250
Denominator:
Basic weighted-average common shares outstanding	229,033		243,969		231,084		243,621
Dilutive effect of restricted stock awards granted to Board of Directors	83		195		76		180
Dilutive effect of time-based restricted stock awards granted under the Equity Plan	2,565		5,223		2,546		4,628
Dilutive effect of performance-based restricted stock awards granted under the Equity Plan	1,541		1,388		1,496		1,033
Diluted weighted-average common shares outstanding	233,222		250,775		235,202		249,462