Marketable Securities (Schedule Of Marketable Securities Classified As Cash Equivalents) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Gain (Loss) on Investments [Line Items]
Cost	$ 4,993	$ 791
Unrealized Gains	0	0
Unrealized Losses	0	0
Recorded Basis	4,993	791
Money Market And Certificates Of Deposit
Gain (Loss) on Investments [Line Items]
Cost	4,993	791
Unrealized Gains	0	0
Unrealized Losses	0	0
Recorded Basis	4,993	791
Foreign Accounts
Gain (Loss) on Investments [Line Items]
Cash And Marketable Securities Held In Foreign Accounts	$ 357	$ 701