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Net Income Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings 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 (shares in thousands):
 
 
2019
 
2018
 
2017
Net income (loss) attributable to shareholders
 
$
(204,087
)
 
$
716,195

 
$
402,176

Weighted-average shares outstanding - basic
 
83,568

 
87,476

 
88,681

Net effect of various dilutive stock-based compensation awards
 
—

 
968

 
1,085

Weighted-average shares outstanding - diluted
 
83,568

 
88,444

 
89,766

Net income (loss) per share:
 
 
 
 
 
 
Basic
 
$
(2.44
)
 
$
8.19

 
$
4.54

Diluted (a)
 
$
(2.44
)
 
$
8.10

 
$
4.48



(a)
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 and stock-based compensation awards for the issuance of 1,614 shares were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive. Stock-based compensation awards for the issuance of 651 shares, and 380 shares for the years ended December 31, 2018, and 2017, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.