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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2016
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2015
Fair Value Measurements [Abstract]        
Purchase price in escrow       $ 1,960
Escrow receivable   $ 1,470 $ 1,470  
Asset impairment charge $ 1,255