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Earnings Per Share | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share Disclosure [Abstract] |
Earnings Per Share | Note 1 7 EARNINGS PER SHARE The following table sets forth the computation of basic and diluted earnings per share on net income (in thousands, except per share information):
| 2012 |  | 2011 |  | 2010
Earnings: |  |  |  |  |  |  |  |
| Net income (numerator for basic and diluted calculations) | $ | 631,893 |  | $ | 546,045 |  | $ | 535,742
Shares: |  |  |  |  |  |  |  |
| Weighted average outstanding shares (denominator for basic calculations) |  |  |  |  |  |  |  |
|  |  | 73,737 |  |  | 73,586 |  |  | 73,157
Equivalent shares from outstanding stock options and warrants |  | 416 |  |  | 522 |  |  | 1,537
|  | Diluted shares (denominator for diluted calculations) |  | 74,153 |  |  | 74,108 |  |  | 74,694
Earnings per share: |  |  |  |  |  |  |  |
| Basic | $ | 8.57 |  | $ | 7.42 |  | $ | 7.32
| Diluted | $ | 8.52 |  | $ | 7.37 |  | $ | 7.17
The calculation of common equivalent shares does not include the impact of options having a strike or conversion price that exceeds the average stock price for the earnings period, as the result would be antidilutive. The calculation of common equivalent shares also excludes the impact of outstanding performance contingent shares, as the conditions necessary for their issuance have not been satisfied as of the end of the reporting period. Approximately 1.8 million, 1.1 million and 0.7 million outstanding stock options were not included in the calculation of common equivalent shares during 2012, 2011 and 2010, respectively. Approximately 0.7 million, 0.8 million and 0.7 million performance contingent shares were excluded from the calculation of common equivalent shares during 2012, 2011 and 2010, respectively.

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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=6920599&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=6945512&loc=d3e4984-109258 Reference 3: 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 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=6920599&loc=d3e1278-109256 Reference 5: 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 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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