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Income Taxes (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended |  | 3 Months Ended |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011 German Tax Authority [Member] | Mar. 31, 2012 German Tax Authority [Member] | Mar. 31, 2012 German Tax Authority [Member] Minimum [Member] | Mar. 31, 2012 German Tax Authority [Member] Maximum [Member] | Mar. 31, 2012 Canadian Revenue Agency [Member] | Mar. 31, 2012 Canadian Revenue Agency [Member] Settlement of Tax Examination [Member] | Mar. 31, 2012 Canadian Revenue Agency [Member] Letter of Credit [Member] | Mar. 31, 2012 Canadian Revenue Agency [Member] Minimum [Member] | Mar. 31, 2012 Canadian Revenue Agency [Member] Maximum [Member]
Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Effective tax rate on continuing operations | 31.00% | 31.00% |  |  |  |  |  |  |  |  |
Discrete tax benefit principally related to the resolution of tax audits | $ (6,733,000) | $ (1,413,000) |  |  |  |  |  |  |  |  |
Estimated range of change, upper bound | 0 |  |  |  |  |  |  |  |  |  |
Estimated range of change, lower bound | (300,000) |  |  |  |  |  |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits |  |  |  | 22,900,000 |  |  |  |  |  |  |
Discrete tax benefit related to settlement |  |  |  |  |  |  | 7,000,000 |  |  |  |
Years under examination |  |  |  |  | 2000 | 2003 |  |  |  | 2001 | 2008
Payment to taxing authority to pursue litigation |  |  | 13,300,000 |  |  |  |  |  |  |  |
Refund from tax settlement |  |  |  |  |  |  | 1,500,000 |  |  |  |
Reduction of deferred tax asset |  |  |  |  |  |  |  | 2,700,000 |  |  |
Short-term debt |  |  |  |  |  |  |  |  | 50,000,000 |  |
Amount of reasonably possible benefit | $ 8,700,000 |  |  |  |  |  |  |  |  |  |

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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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