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Intangible Assets and Goodwill (Narative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Intangible Assets and Goodwill [Abstract]      
Amortization of intangible assets $ 1,367 $ 1,644 $ 1,303