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Derivatives And Hedging Activities (Details)
$ in Thousands, € in Millions
3 Months Ended 9 Months Ended
Apr. 11, 2018
USD ($)
Sep. 30, 2018
USD ($)
Apr. 01, 2018
USD ($)
Oct. 01, 2017
USD ($)
Sep. 30, 2018
USD ($)
Oct. 01, 2017
USD ($)
Sep. 30, 2018
EUR (€)
Apr. 27, 2018
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Oct. 01, 2017
EUR (€)
Derivative [Line Items]                      
Company's business conducted outside United States         70.00%            
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax         $ 2,600            
Payments for Hedge, Financing Activities         30,285            
Payments for (Proceeds from) Hedge, Financing Activities         30,285 $ 11,539          
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net   $ 0     0            
Foreign Currency Transaction Gain (Loss), before Tax   (4,300)   $ 2,700 $ 8,800 5,400          
European And Asian Currencies [Member]                      
Derivative [Line Items]                      
Maximum maturity period for foreign exchange contracts, in months         12 months            
Duration Of Foreign Currency Derivatives         30 days            
Fair Value Hedging [Member]                      
Derivative [Line Items]                      
Notional Amount of Cash Flow Hedge Instruments   180,400   140,000 $ 180,400 140,000     $ 212,100    
Notional Amount of Euro Derivatives [Member]                      
Derivative [Line Items]                      
Notional Amount of Cash Flow Hedge Instruments | €             € 48.7 € 298.7   € 57.2 € 19.0
Notional Amount of US Dollar Derivatives [Member] | Cash Flow Hedging [Member]                      
Derivative [Line Items]                      
Notional Amount of Cash Flow Hedge Instruments   28,000   $ 12,300 28,000 $ 12,300     $ 1,253,000    
Net Investment Hedging [Member] | 1.875 Percent Ten Year Senior Unsecured Notes [Member]                      
Derivative [Line Items]                      
Notional Amount of Nonderivative Instruments         135,100            
Unrealized Gain (Loss) on Net Investment Hedge in AOCI   (800) $ (2,100)   (7,700)            
Net Investment Hedging [Member] | 0.6 Percent Senior Unsecured Notes due in April 2021 [Member]                      
Derivative [Line Items]                      
Notional Amount of Nonderivative Instruments $ 298,700       298,700            
Unrealized Gain (Loss) on Net Investment Hedge in AOCI   $ (1,800)     $ (22,600)