Derivative Instruments And Hedging Activities (Gain (Loss) Reclassified From Accumulated OCI Into Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (150)	$ (84)
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)		109
Interest Rate Contracts [Member] | Net Interest Expense [Member]
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		(193)
Foreign Exchange Forward [Member] | Cost of Sales [Member]
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (150)