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Financial Instruments (Details)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2011
Carrying (Reported) Amount, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2010
Carrying (Reported) Amount, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2011
Estimate of Fair Value, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2010
Estimate of Fair Value, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
USD ($)
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
USD ($)
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
USD ($)
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
USD ($)
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
USD ($)
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
USD ($)
Dec. 31, 2011
Foreign Exchange Forward [Member]
Net Investment Hedging [Member]
Other Liabilities [Member]
USD ($)
Dec. 31, 2011
Foreign Exchange Forward [Member]
Net Investment Hedging [Member]
Other Liabilities [Member]
EUR (€)
Dec. 31, 2011
Cross Currency Interest Rate Contract [Member]
Net Investment Hedging [Member]
Other Liabilities [Member]
Designated as Hedging Instrument [Member]
USD ($)
Dec. 31, 2011
Cross Currency Interest Rate Contract [Member]
Net Investment Hedging [Member]
Other Liabilities [Member]
Designated as Hedging Instrument [Member]
CHF
Dec. 31, 2010
Cross Currency Interest Rate Contract [Member]
Net Investment Hedging [Member]
Other Liabilities [Member]
Designated as Hedging Instrument [Member]
USD ($)
Dec. 31, 2011
Foreign Exchange Option [Member]
Cash Flow Hedging [Member]
Designated as Hedging Instrument [Member]
USD ($)
Dec. 31, 2010
Foreign Exchange Option [Member]
Cash Flow Hedging [Member]
Designated as Hedging Instrument [Member]
USD ($)
Derivatives, Fair Value [Line Items]                                        
Notional amount of foreign currency derivatives                           $ 350,000 € 258,719 $ 50,000 65,100   $ 83,541 $ 63,935
Changes due to translation adjustment for investment                               (21,656)   (19,774)    
Assets:                                        
Foreign currency cash flow hedges (Asset) 394 503           0   394 503                  
Short-term investments               0 121,734 0 0 0 0              
Foreign currency exchange contracts (Asset) 394 503           0   394 503                  
Liabilities:                                        
Foreign currency cash flow hedges (Liability) (1,284) 0           0 0 1,284 0 0 0              
Net investment hedge derivative (21,656) (19,774)           0 0 21,656 19,774 0 0              
Foreign currency exchange contracts (1,284) 0           0 0 1,284 0 0 0              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                                        
Long-term debt instruments, book value       2,187,252 1,807,476                              
Long-term debt instruments, fair value           2,679,793 1,976,363                          
Settlement of net investment hedge 18,211 0 0                                  
Original maturities of short-term investments, earliest (in months) 3                                      
Original maturities of short-term investments, latest (in years) 1                                      
Long-term debt instruments, current portion $ 1,022 $ 16,590