Fair Value Of Financial Instruments (Changes In Fair Value Measurement Of Level 3 Items) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 30,126
Unrealized Gain (Loss) on Derivatives	(2,402)	$ 14,130	$ (2,249)
contingent interest payment for debenture	13,385	10,759	$ 0
Ending balance	$ 14,339	$ 30,126