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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2014
Earnings Per Share [Abstract]  
Reconciliation Between Basic and Diluted Earnings Per Share
A reconciliation between basic and diluted earnings per share is as follows (in thousands, except per share data):
 
 
Quarter Ended June 30,
 
Six Months Ended June 30,
 
2014
 
2013
 
2014
 
2013
Net income for basic and diluted earnings per share
$
137,673

 
$
24,747

 
$
164,130

 
$
100,973

Weighted-average common shares outstanding
222,189

 
219,502

 
221,745

 
219,301

Dilutive effect of stock options, performance share awards and restricted stock awards
1,192

 
1,146

 
1,310

 
1,295

Diluted weighted-average shares outstanding
223,381

 
220,648

 
223,055

 
220,596

Basic earnings per share
$
0.62

 
$
0.11

 
$
0.74

 
$
0.46

Diluted earnings per share
$
0.62

 
$
0.11

 
$
0.74

 
$
0.46