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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, 2011 | Dec. 31, 2010 | Dec. 31, 2009
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 |  |
Value of shares repurchased from employees, separate from other authorizations |  |  |  | $ 2,800,000 | $ 4,000,000 | $ 7,400,000

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- Definition Value of shares repurchased under authorized repurchase programs + References No definition available. + Details
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