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Shareholders' Equity (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Repurchases of common stock | 2,922,822 |  |
Preferred Stock, Shares Authorized | 2,000,000 |  |
Stock Repurchase Program, Amount Authorized | 200,000 |  |
Treasury Stock, Value, Acquired, Cost Method | 102,285 |  |
Common Stock Issued [Member] |  |  |
Common stock outstanding, Beginning balance | 125,382 | 125,337 | 125,287
Shares issued for stock-based compensation awards | 42 | 45 | 50
Repurchases of common stock | 0 | 0 | 0
Common stock outstanding, Ending balance | 125,424 | 125,382 | 125,337
Treasury Stock [Member] |  |  |
Common stock outstanding, Beginning balance | 13,568 | 10,690 | 5,459
Shares issued for stock-based compensation awards | (1,326) | (2,662) | (1,070)
Repurchases of common stock | 7,181 | 5,540 | 6,301
Common stock outstanding, Ending balance | 19,423 | 13,568 | 10,690
Common Stock at Par Value [Member] |  |  |
Common stock outstanding, Beginning balance | 111,814 | 114,647 | 119,828
Shares issued for stock-based compensation awards | 1,368 | 2,707 | 1,120
Repurchases of common stock | (7,181) | (5,540) | (6,301)
Common stock outstanding, Ending balance | 106,001 | 111,814 | 114,647

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- Definition Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any. + References Reference 1: 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 Reference 2: 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 3: 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-Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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