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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Reconciliation Between Basic and Diluted Earnings Per Share
 
Year Ended December 31,
 
2014
 
2013
 
2012
Net income for basic and diluted earnings per share
$
764,146

 
$
473,692

 
$
18,287

Weighted-average common shares outstanding
221,658

 
219,638

 
217,930

Dilutive effect of stock options, performance share awards and restricted stock awards
1,386

 
1,303

 
1,527

Diluted weighted-average shares outstanding
223,044

 
220,941

 
219,457

Basic earnings per share:
 
 
 
 
 
Net income
$
3.45

 
$
2.16

 
$
0.08

Diluted earnings per share:
 
 
 
 
 
Net income
$
3.43

 
$
2.14

 
$
0.08