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Income Taxes (Significant Valuation Allowances) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Tax Credit Carryforward [Line Items]    
Valuation allowance $ 14,455 $ 12,434
United States    
Tax Credit Carryforward [Line Items]    
Valuation allowance 12,300 10,100
Domestic Tax Authority | United States    
Tax Credit Carryforward [Line Items]    
Valuation allowance 4,240 3,040
State and Local Jurisdiction | United States    
Tax Credit Carryforward [Line Items]    
Valuation allowance 8,057 7,092
Capital Loss Carryforward | Israel    
Tax Credit Carryforward [Line Items]    
Valuation allowance $ 1,457 $ 1,622