Derivative Instruments And Hedging Activities (Derivatives Not Designated As Hedging Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivative [Line Items]
Asset derivatives not designated as hedging instruments	$ 6	$ 5,946
Liability derivatives not designated as hedging instruments		16,298
Accrued Liabilities [Member] | Oil Contract [Member]
Derivative [Line Items]
Liability derivatives not designated as hedging instruments		15,777
Accrued Liabilities [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Liability derivatives not designated as hedging instruments		489
Other Liabilities [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Liability derivatives not designated as hedging instruments		32
Other Current Assets [Member] | Foreign Exchange Contracts [Member]
Derivative [Line Items]
Asset derivatives not designated as hedging instruments	6	146
Other Current Assets [Member] | Oil Contract [Member]
Derivative [Line Items]
Asset derivatives not designated as hedging instruments		$ 5,800