Debt (Schedule Of Debt Maturities) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Debt [Abstract]
Quarterly installments due from March 31, 2012 to September 30, 2012	$ 9,928
Quarterly installments due from December 31, 2012 to September 30, 2013	14,893
Quarterly installments due from December 31, 2013 to September 30, 2014	19,856
Quarterly installments due from December 31, 2014 to June 30, 2015	$ 24,820