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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Calculation of Net Income Per Share | The calculation of net income per share for the three years ended December 31, 2012 is reflected in the following table (in thousands, except per share amounts):
|  | Years Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Basic net income per share: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 209,942 |  |  | $ | 149,922 |  |  | $ | 66,069 |
Income allocated to participating securities |  |  | 1,081 |  |  |  | 2,159 |  |  |  | 2,340 |
Net income available to common stockholders |  | $ | 208,861 |  |  | $ | 147,763 |  |  | $ | 63,729 |
Basic weighted average shares |  |  | 138,201 |  |  |  | 140,479 |  |  |  | 142,833 |
Basic net income per share |  | $ | 1.51 |  |  | $ | 1.05 |  |  | $ | .45 |
Diluted net income per share: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 209,942 |  |  | $ | 149,922 |  |  | $ | 66,069 |
Income allocated to participating securities |  |  | 1,075 |  |  |  | 2,150 |  |  |  | 2,340 |
Net income available to common stockholders |  | $ | 208,867 |  |  | $ | 147,772 |  |  | $ | 63,729 |
Basic weighted average shares |  |  | 138,201 |  |  |  | 140,479 |  |  |  | 142,833 |
Dilutive effect of potential common shares |  |  | 1,208 |  |  |  | 1,311 |  |  |  | 1,195 |
Diluted weighted average shares |  |  | 139,409 |  |  |  | 141,790 |  |  |  | 144,028 |
Diluted net income per share |  | $ | 1.50 |  |  | $ | 1.04 |  |  | $ | .44 |

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- Definition Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends. + 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 (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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