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Earnings per Common Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Calculation of basic and diluted weighted-average shares outstanding
The following is a calculation of basic and diluted weighted-average shares outstanding:
 
 
Year Ended December 31,
(In thousands)
 
2018
 
2017
 
2016
Weighted-average shares - basic
 
445,538

 
463,735

 
456,847

Dilution effect of stock appreciation rights and stock awards at end of period
 
2,030

 
1,816

 
—

Weighted-average shares - diluted
 
447,568

 
465,551

 
456,847
Calculation of weighted-average shares excluded from diluted EPS due to the anti-dilutive effect
The following is a calculation of weighted-average shares excluded from diluted EPS due to the anti-dilutive effect:
 
 
Year Ended December 31,
(In thousands)
 
2018
 
2017
 
2016
Weighted-average stock appreciation rights and stock awards excluded from diluted EPS due to the anti-dilutive effect due to net loss
 
—

 
—

 
1,478

Weighted-average stock appreciation rights and stock awards excluded from diluted EPS due to the anti-dilutive effect calculated using the treasury stock method
 
3

 
28

 
1

Weighted-average stock appreciation rights and stock awards excluded from diluted EPS due to the anti-dilutive effect
 
3

 
28

 
1,479