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Recent Accounting Pronouncements (Recent Accounting Pronouncements) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2019
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Right-of-use asset   $ 5,649  
Cumulative adjustment for fair value of equity securities    
Accounting Standards Update 2016-02 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Right-of-use asset     $ 6,200
Retained Earnings [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative adjustment for fair value of equity securities 201    
Accumulated Other Comprehensive Loss [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative adjustment for fair value of equity securities $ (201)