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Net Income Per Share
 12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Net Income Per Share
Net Income Per Share:

Net income per share is calculated as follows (in thousands, except per share amounts):
 
2016
 
Net
Income
 
Shares
 
Per Share
Amount
Basic net income per share
$
437,120

 
132,905

 
$
3.29

Dilutive stock options and restricted stock units outstanding
—

 
908

 
(0.02
)
Diluted net income per share
$
437,120

 
133,813

 
$
3.27


 
2015
 
Net
Income
 
Shares
 
Per Share
Amount
Basic net income per share
$
410,395

 
135,582

 
$
3.03

Dilutive stock options and restricted stock units outstanding
—

 
1,263

 
(0.03
)
Diluted net income per share
$
410,395

 
136,845

 
$
3.00


 
2014
 
Net
Income
 
Shares
 
Per Share
Amount
Basic net income per share
$
370,885

 
137,769

 
$
2.69

Dilutive stock options and restricted stock units outstanding
—

 
1,666

 
(0.03
)
Diluted net income per share
$
370,885

 
139,435

 
$
2.66



Anti-dilutive stock options excluded from the above calculations totaled approximately 1.9 million, 0.9 million and 1.0 million in fiscal 2016, 2015 and 2014, respectively.