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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Summary of Significant Accounting Policies [Abstract]    
Impairment of investments $ 0  
Unrecognized Tax Benefits 0 $ 0
Unrecognized tax benefits expected within next twelve months $ 0