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Fair Value Measurements And Derivative Instruments (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2013
Derivatives, Fair Value [Line Items]      
Fair value of long-term debt     $ 549,800,000
Loan balance, net of unamortized discount   535,709,000  
Unrealized gain on foreign currency derivatives   1,300,000  
Unrealized loss on foreign currency derivatives 100,000    
Commodity derivative contracts, unrealized gain 800,000 0  
Foreign Currency Derivatives [Member]
     
Derivatives, Fair Value [Line Items]      
Notional amounts of foreign currency derivatives 183,700,000   138,600,000
Commodity Derivative Contracts [Member] | Refined Oil Products [Member]
     
Derivatives, Fair Value [Line Items]      
Outstanding derivative swap contracts 45,800,000    
Minimum [Member] | Foreign Currency Derivatives [Member]
     
Derivatives, Fair Value [Line Items]      
Derivative maturities January 2014    
Minimum [Member] | Commodity Derivative Contracts [Member]
     
Derivatives, Fair Value [Line Items]      
Derivative maturities January 2014    
Maximum [Member] | Foreign Currency Derivatives [Member]
     
Derivatives, Fair Value [Line Items]      
Derivative maturities September 2014    
Maximum [Member] | Commodity Derivative Contracts [Member]
     
Derivatives, Fair Value [Line Items]      
Derivative maturities June 2014    
Level 2 [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value of long-term debt $ 546,300,000