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Quarterly Financial Data (Narrative) (Details) (USD $) | 3 Months Ended
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Dec. 31, 2012 Owners | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges, per share | $ 0.02 | $ 0.05 | $ 0.06 | $ 0.01 | $ 0.1 | $ 0.06 | $ 0.04 | $ 0.0 | $ 0.02 | $ 0.02 | $ 0.01 | $ 0.03
Pension plan settlement, per share |  |  | $ 2.34 | $ 0.22 |  |  |  |  |  |  |  |
Tax settlement, per share |  |  |  | $ 0.23 |  |  |  |  |  |  |  |
Per share tax effect from prior period corrections |  |  |  |  | $ 0.11 |  |  |  |  |  |  |
Number of beneficial owners, including employees owning shares through the Company's 401(k) | 5,500 |  |  |  |  |  |  |  |  |  |  |

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- Details
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