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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified |  |  | 12 Months Ended |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2010 Convertible Senior Debentures, Due 2040 [Member] | Dec. 31, 2011 Convertible Senior Debentures, Due 2040 [Member] | Dec. 31, 2011 Convertible Senior Debentures, Due 2041 [Member] | Dec. 31, 2011 U.S. Plans [Member] | Dec. 31, 2010 U.S. Plans [Member] | Dec. 31, 2009 U.S. Plans [Member] | Dec. 31, 2011 Non-U.S. Plans [Member] | Dec. 31, 2010 Non-U.S. Plans [Member] | Dec. 31, 2009 Non-U.S. Plans [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 1 [Member] U.S. Plans [Member] Equity Securities [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 1 [Member] U.S. Plans [Member] Equity Securities [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 1 [Member] U.S. Plans [Member] Fixed Income Securities [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 1 [Member] U.S. Plans [Member] Fixed Income Securities [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 1 [Member] U.S. Plans [Member] Real Estate Investment Trust Securities [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 1 [Member] U.S. Plans [Member] Real Estate Investment Trust Securities [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 1 [Member] U.S. Plans [Member] Cash and Cash Equivalents [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 1 [Member] U.S. Plans [Member] Cash and Cash Equivalents [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 1 [Member] Non-U.S. Plans [Member] Equity Securities [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 1 [Member] Non-U.S. Plans [Member] Equity Securities [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 1 [Member] Non-U.S. Plans [Member] Fixed Income Securities [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 1 [Member] Non-U.S. Plans [Member] Fixed Income Securities [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 1 [Member] Non-U.S. Plans [Member] Cash and Cash Equivalents [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 1 [Member] Non-U.S. Plans [Member] Cash and Cash Equivalents [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 2 [Member] U.S. Plans [Member] Equity Securities [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 2 [Member] U.S. Plans [Member] Equity Securities [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 2 [Member] U.S. Plans [Member] Fixed Income Securities [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 2 [Member] U.S. Plans [Member] Fixed Income Securities [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 2 [Member] U.S. Plans [Member] Real Estate Investment Trust Securities [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 2 [Member] U.S. Plans [Member] Real Estate Investment Trust Securities [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 2 [Member] U.S. Plans [Member] Cash and Cash Equivalents [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 2 [Member] U.S. Plans [Member] Cash and Cash Equivalents [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 2 [Member] Non-U.S. Plans [Member] Equity Securities [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 2 [Member] Non-U.S. Plans [Member] Equity Securities [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 2 [Member] Non-U.S. Plans [Member] Fixed Income Securities [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 2 [Member] Non-U.S. Plans [Member] Fixed Income Securities [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 2 [Member] Non-U.S. Plans [Member] Cash and Cash Equivalents [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 2 [Member] Non-U.S. Plans [Member] Cash and Cash Equivalents [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member] Convertible Senior Debentures, Due 2040 [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 3 [Member] Convertible Senior Debentures, Due 2040 [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member] Convertible Senior Debentures, Due 2041 [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member] U.S. Plans [Member] Equity Securities [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 3 [Member] U.S. Plans [Member] Equity Securities [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member] U.S. Plans [Member] Fixed Income Securities [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 3 [Member] U.S. Plans [Member] Fixed Income Securities [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member] U.S. Plans [Member] Real Estate Investment Trust Securities [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 3 [Member] U.S. Plans [Member] Real Estate Investment Trust Securities [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member] U.S. Plans [Member] Cash and Cash Equivalents [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 3 [Member] U.S. Plans [Member] Cash and Cash Equivalents [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member] Non-U.S. Plans [Member] Equity Securities [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 3 [Member] Non-U.S. Plans [Member] Equity Securities [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member] Non-U.S. Plans [Member] Fixed Income Securities [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 3 [Member] Non-U.S. Plans [Member] Fixed Income Securities [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member] Non-U.S. Plans [Member] Cash and Cash Equivalents [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 3 [Member] Non-U.S. Plans [Member] Cash and Cash Equivalents [Member]
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets held in rabbi trusts | $ 31,698 | $ 25,585 |  |  |  |  |  |  |  |  |  | $ 20,569 | $ 15,575 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,129 | $ 10,010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets | 274,589 | 270,984 |  |  |  | 239,045 | 238,523 | 216,641 | 35,544 | 32,461 | 34,762 |  |  | 138,379 | 142,808 | 40,606 | 39,063 | 6,486 | 6,339 | 338 | 2,143 | 6,815 | 7,751 | 10,173 | 8,538 | 18,556 | 16,172 |  |  | 0 | 0 | 53,236 | 48,170 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
Available for sale securities | 6,776 | 5,736 |  |  |  |  |  |  |  |  |  | 6,776 | 5,736 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets | 313,063 | 302,305 |  |  |  |  |  |  |  |  |  | 248,698 | 244,125 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 64,365 | 58,180 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Assets | 313,063 | 302,305 |  |  |  |  |  |  |  |  |  | 248,698 | 244,125 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 64,365 | 58,180 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Embedded derivative |  |  | (319) | (594) | (392) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (594) | (319) | (392) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 533,900 | 624,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debentures issuance date |  |  | November 9, 2010 |  | May 13, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt | $ 398,068 | $ 431,363 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -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 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -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 Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44A, 44B -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 Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 12-16, 44A, 44B -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums and derivative liability, if any. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of assets held in rabbi trusts to fund payments under deferred compensation and non-qualified pension plans. + References No definition available. + Details
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