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Earnings Per Share | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share [Abstract] |
Earnings Per Share | 8. Earnings Per Share Basic earnings per share is calculated by dividing income available to common shareholders by the weighted-average number of shares of common stock outstanding during each period. Diluted earnings per share (“diluted EPS”) is calculated using income available to common shareholders divided by diluted weighted-average shares of common stock outstanding during each period. Potentially dilutive securities include shares of common stock underlying stock options, SOSARs and non-vested stock awards. Diluted EPS considers the impact of potentially dilutive securities except in periods in which there is a loss because the inclusion of the potential common shares would have an anti-dilutive effect. SOSARs to purchase 360, 240 and 340 shares of common stock were excluded from the calculation of 2012, 2011 and 2010 diluted EPS, respectively, because they were anti-dilutive. In addition, 449, 224 and 60 stock awards subject to performance conditions were excluded from the 2012, 2011 and 2010 calculations of diluted EPS. The following table sets forth the computations of basic and dilutive earnings per share:
| Year ended December 31
| 2012 |  | 2011 |  | 2010
Net income | $ | 278,000 |  | $ | 214,945 |  | $ | 178,981
Shares: |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding |  | 31,513 |  |  | 31,217 |  |  | 31,234
Dilutive stock options and SOSARs |  | 254 |  |  | 497 |  |  | 422
Dilutive non-vested stock awards |  | 16 |  |  | 61 |  |  | 79
Diluted weighted average number of common shares outstanding |  | 31,783 |  |  | 31,775 |  |  | 31,735
Basic earnings per share | $ | 8.82 |  | $ | 6.89 |  | $ | 5.73
Diluted earnings per share | $ | 8.75 |  | $ | 6.76 |  | $ | 5.64

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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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