Fair Value Of Financial Instruments (Changes In Fair Value Measurement Of Level 3 Items) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 26,755	$ 29,004
contingent interest payment for debenture	(5,225)	0
Unrealized (gain) loss on contingent interest derivative on Convertible Debentures	7,019	(5,269)
Ending balance	$ 28,549	$ 23,735