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Common Stock Activity (Summary of Share Activity) (Details) | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Rollforward of Share Activity, Common and Treasury Shares |  |
Shares issued for stock option exercises | 194,200 | 20,000
Treasury shares, beginning balance | 9,467,286 |
Treasury shares, ending balance | 9,467,286 |
Common Stock Outstanding Member [Member] |  |
Rollforward of Share Activity, Common and Treasury Shares |  |
Common shares outstanding, beginning balance | 76,448,000 |
Shares issued for stock option exercises | 194,000 |
Shares issued for restricted stock awards | 21,000 |
Other shares issued | 125,000 |
Common shares outstanding, ending balance | 76,789,000 |

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- Definition Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4, 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 + Details
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