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Net Income (Loss) Per Share
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Net Income (Loss) Per Share [Text Block] Net Income (Loss) Per Share
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):
 202020192018
Net income (loss) attributable to shareholders$584,438 $(204,087)$716,195 
Weighted-average shares outstanding - basic77,992 83,568 87,476 
Net effect of various dilutive stock-based compensation awards643 — 968 
Weighted-average shares outstanding - diluted78,635 83,568 88,444 
Net income (loss) per share:
Basic
$7.49 $(2.44)$8.19 
Diluted (a)
$7.43 $(2.44)$8.10 

(a)Stock-based compensation awards for the issuance of 1,143 shares, 1,614 shares, and 651 shares for the years ended December 31, 2020, 2019, and 2018, 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.