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Shareholders' Equity (Narrative) (Details) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2006 | Oct. 31, 2005 | Oct. 31, 2002 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Stockholders' Equity Note [Abstract] |  |  |  |  |  |
Stock repurchase program, authorized amount | $ 200,000,000 | $ 100,000,000 | $ 100,000,000 |  |  |
Total stock repurchase authorization |  |  |  | 400,000,000 |  |
Shares repurchased under authorized repurchase programs |  |  |  | 9,688,900 |  |
Value of shares repurchased under authorized repurchase programs |  |  |  | 297,700,000 |  |
Stock Repurchased Under Repurchase Program During Period, Value |  |  |  | 0 | 0 | 0
Remaining value of stock repurchase programs authorization |  |  |  | 102,300,000 |  |
Payments for Repurchase of Common Stock |  |  |  | $ 961,000 | $ 2,836,000 | $ 4,023,000

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 + Details
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