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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2014
Earnings Per Share [Abstract] |
Calculation of Net Income Per Share | The calculation of net income per share for the three years ended December 31, 2014 is reflected in the following table (in thousands, except per share amounts):
|  | Years Ended December 31,
|  | 2014 |  | 2013 |  | 2012
Basic net income per share: |  |  |  |  |  |
Net income |  | $ | 305,928 |  |  | $ | 252,195 |  |  | $ | 209,942 |
Income allocated to participating securities |  | — |  |  | 3 |  |  | 1,081 |
Net income available to common stockholders |  | $ | 305,928 |  |  | $ | 252,192 |  |  | $ | 208,861 |
Basic weighted average shares |  | 134,358 |  |  | 136,153 |  |  | 138,201 |
Basic net income per share |  | $ | 2.28 |  |  | $ | 1.85 |  |  | $ | 1.51 |
Diluted net income per share: |  |  |  |  |  |
Net income |  | $ | 305,928 |  |  | $ | 252,195 |  |  | $ | 209,942 |
Income allocated to participating securities |  | — |  |  | 3 |  |  | 1,075 |
Net income available to common stockholders |  | $ | 305,928 |  |  | $ | 252,192 |  |  | $ | 208,867 |
Basic weighted average shares |  | 134,358 |  |  | 136,153 |  |  | 138,201 |
Dilutive effect of potential common shares |  | 1,183 |  |  | 1,436 |  |  | 1,208 |
Diluted weighted average shares |  | 135,541 |  |  | 137,589 |  |  | 139,409 |
Diluted net income per share |  | $ | 2.26 |  |  | $ | 1.83 |  |  | $ | 1.50 |
Weighted Average Diluted Common Shares Outstanding | The weighted average diluted common shares outstanding for the years ended December 31, 2014, 2013 and 2012, excludes the effect of the following (in thousands):
|  | Years Ended December 31,
|  | 2014 |  | 2013 |  | 2012
Total number of anti-dilutive potential common shares |  | 1 |  |  | — |  |  | 227 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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