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Income Taxes (Uncertain Tax Positions) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Uncertain tax positions [Roll Forward]    
Balance at January 1, 2018   $ 0
Additions based on tax positions related to current year   31
Additions to tax positions of prior years $ 547 547
Balance at December 31, 2018 $ 578 $ 578