Derivative Instruments And Hedging Activities (Derivatives Not Designated As Hedging Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Asset derivatives not designated as hedging instruments		$ 5,946
Liability derivatives not designated as hedging instruments	823	16,298
Accrued Liabilities [Member] | Foreign Exchange Forward [Member]
Liability derivatives not designated as hedging instruments	821
Accrued Liabilities [Member] | Oil Contract [Member]
Liability derivatives not designated as hedging instruments		15,777
Accrued Liabilities [Member] | Interest Rate Swaps [Member]
Liability derivatives not designated as hedging instruments		489
Other Liabilities [Member] | Foreign Exchange Forward [Member]
Liability derivatives not designated as hedging instruments	2
Other Liabilities [Member] | Interest Rate Swaps [Member]
Liability derivatives not designated as hedging instruments		32
Other Current Assets [Member] | Foreign Exchange Forward [Member]
Asset derivatives not designated as hedging instruments		146
Other Current Assets [Member] | Oil Contract [Member]
Asset derivatives not designated as hedging instruments		$ 5,800