Financial Instruments (Financial Instruments Activity Included As Part Of Accumulated Other Comprehensive Income, Net Of Tax) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Financial Instruments [Abstract]
Balance at beginning of year	$ (15,262)	$ (17,343)
Additions and revaluations	(1,491)	(5,714)
Loss reclassified from AOCI into income	9,604	7,762
Tax rate adjustment	(108)	33
Balance at end of period	$ (7,257)	$ (15,262)