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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2013
Earnings Per Share  
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

 

 

 

 

March 31,

 

 

 

2013

 

2012

Net income for basic and diluted earnings per share

 

  $

76,226

 

  $

46,964

 

 

 

 

 

Weighted-average common shares outstanding

 

219,097

 

217,584

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

 

 

1,387

 

 

1,646

Diluted weighted-average shares outstanding

 

 

220,484

 

 

219,230

 

 

 

 

 

Basic earnings per share

 

  $

0.35

 

  $

0.22

Diluted earnings per share

 

  $

0.35

 

  $

0.21