Derivative Instruments And Hedging Activities (Gain (Loss) Reclassified From Accumulated OCI Into Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (354)	$ 7,903	$ (504)	$ 7,819
Oil And Natural Gas Commodity Contracts [Member] | Income From Discontinued Operations Net Of Tax [Member]
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		8,023		8,132
Interest Rate Swaps [Member] | Net Interest Expense [Member]
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		(120)		(313)
Foreign Exchange Contracts [Member] | Cost of Sales [Member]
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (354)		$ (504)