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Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted (Tables)
 12 Months Ended
Dec. 31, 2019
Schedule of Earnings Per Share, Basic and Diluted [Line Items]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following chart sets forth the computation of earnings per share (in thousands, except per share amounts):
 
Year Ended December 31,
 
2019
 
2018
 
2017
Income from continuing operations
$
543,415

 
$
487,565

 
$
536,974

Denominator for basic earnings per share—Weighted-average shares outstanding
310,155

 
314,428

 
308,607

Effect of dilutive securities:
 
 
 
 
 
RSUs
393

 
409

 
544

PSUs
—

 
—

 
—

Stock options
421

 
1,012

 
1,498

Denominator for diluted earnings per share—Adjusted weighted-average shares outstanding
310,969

 
315,849

 
310,649

Basic earnings per share from continuing operations
$
1.75

 
$
1.55

 
$
1.74

Diluted earnings per share from continuing operations (1)
$
1.75

 
$
1.54

 
$
1.73