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Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Commitments And Contingencies [Abstract]      
Total rent expense $ 1,033 $ 1,515 $ 1,936
Arbitration award $ 1,967