Net Income (Loss) Per Share (Tables)

12 Months Ended

Dec. 31, 2022

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 per share on a basic and diluted basis for the years ended December 31:

(thousands except per share data)	2022		2021		2020
Net income attributable to shareholders	$	1,426,884	$	1,108,197	$	584,438
Weighted-average shares outstanding - basic	64,838		72,472		77,992
Net effect of various dilutive stock-based compensation awards	615		913		643
Weighted-average shares outstanding - diluted	65,453		73,385		78,635
Net income per share:
Basic	$	22.01	$	15.29	$	7.49
Diluted (a)	$	21.80	$	15.10	$	7.43

(a)Stock-based compensation awards for the issuance of 52.6 thousand shares and 1.1 million shares for the years ended December 31, 2022 and 2020, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive. There were no shares excluded from the computation of net income per share on a diluted basis in 2021.