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Other Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2012
Other Employee Benefit Plans [Abstract] |
Schedule of shares purchased in the open market for employees |
|  | Shares purchased |  |  | Average price per share |
2010 |  |  | 4,836 |  |  | $ | 168.86 |
2011 |  |  | 6,636 |  |  | $ | 98.55 |
2012 |  |  | 6,549 |  |  | $ | 71.14 |

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- Definition Tabular disclosure of employee stock purchase plan activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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