Derivative Instruments And Hedging Activities (Derivatives Not Designated As Hedging Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Asset derivatives not designated as hedging instruments	$ 5,946	$ 55
Liability derivatives not designated as hedging instruments	16,298	159
Accrued Liabilities [Member] | Foreign Exchange Forward [Member]
Liability derivatives not designated as hedging instruments		159
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] | 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	55
Other Current Assets [Member] | Oil Contract [Member]
Asset derivatives not designated as hedging instruments	$ 5,800