Fair Value Of Financial Instruments (Changes In Fair Value Measurement Of Level 3 Items) (Details) (Derivative Financial Instruments, Liabilities [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Derivative Financial Instruments, Liabilities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 11,625	$ 10,500
Unrealized (gain) loss on contingent interest derivative on Convertible Debentures	(813)	(450)
Ending balance	$ 12,438	$ 10,950