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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Reconciliation Between Basic and Diluted Earnings Per Share
 
Year Ended December 31,
 
2015
 
2014
 
2013
Net income for basic and diluted earnings per share
$
665,783

 
$
764,146

 
$
473,692

Weighted-average common shares outstanding
219,537

 
221,658

 
219,638

Dilutive effect of stock options, performance share awards and restricted stock awards
1,152

 
1,386

 
1,303

Diluted weighted-average shares outstanding
220,689

 
223,044

 
220,941

Basic earnings per share:
 
 
 
 
 
Net income
$
3.03

 
$
3.45

 
$
2.16

Diluted earnings per share:
 
 
 
 
 
Net income
$
3.02

 
$
3.43

 
$
2.14