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Quarterly Financial Data (Narrative) (Details) (USD $) | 3 Months Ended
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Dec. 31, 2011 Owners | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2009 | Sep. 30, 2009 | Jun. 30, 2009 | Mar. 31, 2009
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges, per share | $ (0.1) | $ (0.06) | $ (0.04) | $ 0.0 | $ (0.03) | $ (0.04) | $ (0.01) | $ (0.04) | $ (0.02) | $ (0.62) | $ (1.05) | $ (0.57)
Gain on extinguishment, per share |  |  |  |  |  |  |  |  | $ 0.09 | $ 0.16 | $ 0.73 | $ 0.06
Purchase price adjustment, per share |  |  |  |  |  |  |  |  |  |  | $ (0.33) |
Per share tax effect from prior period corrections | $ 0.11 |  |  |  |  |  |  |  |  |  |  |
Number of beneficial owners, including employees owning shares through the Company's 401(k) | 6,600 |  |  |  |  |  |  |  |  |  |  |

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