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Net Income Per Share | 12 Months Ended
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Dec. 31, 2012
Net Income Per Share | Note L—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 |
Potential common shares include the dilutive effect of stock options, unvested performance-based restricted stock, restricted stock which contain forfeitable rights to dividends, and stock units. The weighted average diluted common shares outstanding for the years ended December 31, 2012, 2011 and 2010, respectively, excludes the effect of 0.2 million, 0.5 million, and 0.8 million anti-dilutive potential common shares. Employee stock options will have a dilutive effect under the treasury method only when the respective period’s average market value of the Company’s common stock exceeds the exercise proceeds. Under the treasury method, exercise proceeds include the amount the employee must pay for exercising stock options, the amount of compensation cost for future service that the Company has not yet recognized, and the amount of tax benefits that would be recorded in capital surplus, if the options were exercised and the stock units and performance-based restricted stock had vested.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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