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Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted (Tables)
 3 Months Ended
Mar. 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):
 
Three Months Ended
 
March 31,
 
2019
 
2018
Net income
$
99,063

 
$
152,763

Denominator for basic earnings per share—Weighted-average shares outstanding
315,046

 
309,517

Effect of dilutive securities:
 
 
 
RSUs
414

 
619

PSUs
—

 
—

Stock options
558

 
1,211

Denominator for diluted earnings per share—Adjusted weighted-average shares outstanding
316,018

 
311,347

Earnings per share, basic
$
0.31

 
$
0.49

Earnings per share, diluted
$
0.31

 
$
0.49