Fair Value Measurements (Schedule Of Assets and Liabilities Carried and Measured At Fair Value) (Details) - Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Investments	$ 47	$ 49
Assets, Derivatives	21	1
Liabilities, Derivatives	(4)	(58)
Total recorded at fair value	64	(8)
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Investments	47	49
Total recorded at fair value	47	49
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Derivatives	21	1
Liabilities, Derivatives	(4)	(58)
Total recorded at fair value	$ 17	$ (57)