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Financial Instruments (Details)
In Thousands
9 Months Ended
Sep. 30, 2011
USD ($)
Sep. 30, 2010
USD ($)
Dec. 31, 2010
USD ($)
Sep. 30, 2011
Foreign Exchange Forward / Collar Contracts [Member]
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Other Liabilities [Member]
USD ($)
Dec. 31, 2010
Foreign Exchange Forward / Collar Contracts [Member]
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Other Liabilities [Member]
USD ($)
Sep. 30, 2011
Foreign Exchange Forward / Collar Contracts [Member]
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Prepaid and Other Assets [Member]
USD ($)
Dec. 31, 2010
Foreign Exchange Forward / Collar Contracts [Member]
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Prepaid and Other Assets [Member]
USD ($)
Sep. 30, 2011
Foreign Exchange Forward / Collar Contracts [Member]
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Other Accrued Expenses [Member]
USD ($)
Dec. 31, 2010
Foreign Exchange Forward / Collar Contracts [Member]
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Other Accrued Expenses [Member]
USD ($)
Sep. 30, 2011
Cross Currency Interest Rate Contract [Member]
Designated as Hedging Instrument [Member]
Net Investment Hedging [Member]
Other Liabilities [Member]
USD ($)
Sep. 30, 2011
Cross Currency Interest Rate Contract [Member]
Designated as Hedging Instrument [Member]
Net Investment Hedging [Member]
Other Liabilities [Member]
CHF
Dec. 31, 2010
Cross Currency Interest Rate Contract [Member]
Designated as Hedging Instrument [Member]
Net Investment Hedging [Member]
Other Liabilities [Member]
USD ($)
Sep. 30, 2011
Foreign Exchange Forward [Member]
Designated as Hedging Instrument [Member]
Net Investment Hedging [Member]
Other Liabilities [Member]
USD ($)
Sep. 30, 2011
Foreign Exchange Forward [Member]
Designated as Hedging Instrument [Member]
Net Investment Hedging [Member]
Other Liabilities [Member]
EUR (€)
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
USD ($)
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
USD ($)
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
USD ($)
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
USD ($)
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
USD ($)
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
USD ($)
Sep. 30, 2011
Estimate of Fair Value, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2010
Estimate of Fair Value, Fair Value Disclosure [Member]
USD ($)
Sep. 30, 2011
Carrying (Reported) Amount, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2010
Carrying (Reported) Amount, Fair Value Disclosure [Member]
USD ($)
Derivatives, Fair Value [Line Items]                        
Notional amounts of financial instruments$ 98,742 $ 63,935      $ 50,000 65,100 $ 350,000€ 258,719          
Settlement of net investment hedge18,2110                      
Fair Value - Asset (Liability)   (491)0258503(1,687)0(24,482) (19,774)            
Current portion of long-term debt559 1,590                     
Changes due to translation adjustment for investment(24,482) (19,774)                     
Assets [Abstract]                        
Short-term investments              0121,7340000    
Foreign currency cash flow hedges              0025850300    
Liabilities [Abstract]                        
Net investment hedge derivative              0024,48219,77400    
Foreign currency cash flow hedges              002,178000    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                        
Long-term debt                    $ 2,720,377$ 1,961,363$ 2,187,031$ 1,792,476