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Fair Value Measurements And Derivative Instruments (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Fair value of long-term debt $ 342,100,000 $ 273,400,000
Other Long-term Debt, Current 365,400,000 367,200,000
Unrealized loss on foreign currency derivatives 200,000 0
Commodity derivative contracts, unrealized gain 0 0
Hedging Instruments, Non-derivative, Assets 13,300,000 11,800,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax 1,500,000.0 1,400,000
Foreign Currency Derivatives [Member]    
Derivatives, Fair Value [Line Items]    
Notional amounts of foreign currency derivatives $ 22,600,000 $ 18,700,000
Minimum [Member] | Foreign Currency Derivatives [Member]    
Derivatives, Fair Value [Line Items]    
Derivative maturities January, 27 2017