Pension Plans And Other Postretirement Benefit Plans (Deferred Compensation Liabilities Included In Other Non-Current Liabilities And Deferred Credits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Pension Plans And Other Postretirement Benefit Plans [Abstract]
Deferred compensation assets and liabilities	$ 8,653	$ 9,285