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Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2016
Earnings Per Common Share [Abstract]  
Schedule Of Basic And Diluted Earnings Per Share
The following table summarizes the calculation of basic and diluted EPS for the three and nine months ended September 30, 2016 and 2015:
 
Three months ended
 
Nine months ended
 
September 30,
 
September 30,
 
2016
 
2015
 
2016
 
2015
Net income (loss) used for basic and diluted calculation
$
94,338

 
$
(183,757
)
 
$
306,564

 
$
77,781

Shares used in computing earnings per common share—basic
224,180

 
226,228

 
224,454

 
209,373

Weighted-average effect of dilutive securities:
 
 
 
 
 
 
 
Stock awards
1,908

 
—

 
2,106

 
2,435

Shares used in computing earnings per common share—diluted
226,088

 
226,228

 
226,560

 
211,808

Earnings (loss) per common share:
 
 
 
 

 

Basic
$
0.42

 
$
(0.81
)
 
$
1.37

 
$
0.37

Diluted
$
0.42

 
$
(0.81
)
 
$
1.35

 
$
0.37