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Significant Accounting Policies Impairment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]      
Impairment of Long-Lived Assets to be Disposed of $ 111 $ 137 $ 0
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ 0 $ 0 $ 0