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Financial Instruments (Details) In Thousands, unless otherwise specified | Mar. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Mar. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] USD ($) | Dec. 31, 2011 Estimate of Fair Value, Fair Value Disclosure [Member] USD ($) | Mar. 31, 2012 Carrying (Reported) Amount, Fair Value Disclosure [Member] USD ($) | Dec. 31, 2011 Carrying (Reported) Amount, Fair Value Disclosure [Member] USD ($) | Mar. 31, 2012 Fair Value, Inputs, Level 2 [Member] USD ($) | Dec. 31, 2011 Fair Value, Inputs, Level 2 [Member] USD ($) | Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] USD ($) | Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] USD ($) | Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] USD ($) | Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] USD ($) | Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] USD ($) | Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] USD ($) | Mar. 31, 2012 Cross Currency Interest Rate Contract [Member] Designated as Hedging Instrument [Member] Net Investment Hedging [Member] Other Liabilities [Member] USD ($) | Mar. 31, 2012 Cross Currency Interest Rate Contract [Member] Designated as Hedging Instrument [Member] Net Investment Hedging [Member] Other Liabilities [Member] CHF | Dec. 31, 2011 Cross Currency Interest Rate Contract [Member] Designated as Hedging Instrument [Member] Net Investment Hedging [Member] Other Liabilities [Member] USD ($) | Mar. 31, 2012 Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Prepaid and Other Assets [Member] USD ($) | Dec. 31, 2011 Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Prepaid and Other Assets [Member] USD ($) | Mar. 31, 2012 Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Other Accrued Expenses [Member] USD ($) | Dec. 31, 2011 Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Other Accrued Expenses [Member] USD ($)
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Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amounts of financial instruments | $ 71,787 | $ 83,541 |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000 | 65,100 |  |  |  |  |
Fair Value - Asset (Liability) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (23,669) |  | (21,656) | 241 | 394 | (214) | (1,284)
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 0 |  |  |  |  |  |  |
Foreign currency cash flow hedges |  |  |  |  |  |  |  |  | 0 | 0 | 241 | 394 | 0 | 0 |  |  |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment hedge derivative - cross currency swap |  |  |  |  |  |  | 23,669 | 21,656 | 0 | 0 |  |  | 0 | 0 |  |  |  |  |  |  |
Foreign currency cash flow hedges |  |  |  |  |  |  |  |  | 0 | 0 | 214 | 1,284 | 0 | 0 |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 2,590,620 | $ 2,679,793 | $ 2,195,267 | $ 2,187,252 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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