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Net Income Per Share | 12 Months Ended
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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.

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