Net Income (Loss) Per Share (Tables)

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

Schedule of Earnings (Losses) Per Share, Basic and Diluted [Table Text Block]

The following table presents the computation of net income (loss) per share on a basic and diluted basis for the years ended December 31 (shares in thousands):

	2021		2020		2019
Net income (loss) attributable to shareholders	$	1,108,197	$	584,438	$	(204,087)
Weighted-average shares outstanding - basic	72,472		77,992		83,568
Net effect of various dilutive stock-based compensation awards	913		643		—
Weighted-average shares outstanding - diluted	73,385		78,635		83,568
Net income (loss) per share:
Basic	$	15.29	$	7.49	$	(2.44)
Diluted (a)	$	15.10	$	7.43	$	(2.44)

(a)Stock-based compensation awards for the issuance of 1,143 shares and 1,614 shares for the years ended December 31, 2020 and 2019, respectively, were excluded from the computation of net income (loss) per share on a diluted basis as their effect was anti-dilutive. As the company reported a net loss attributable to shareholders for 2019, basic and diluted net loss per share attributable to shareholders are the same.