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Intangible Assets - Consolidated balance sheet (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Amortizable intangible assets:    
Gross Carrying Amount $ 3,500 $ 3,500
Accumulated Amortization (1,944) (1,828)
Net $ 1,556 1,672
Customer Relationships [Member]    
Amortizable intangible assets:    
Weighted Average Life (Years) 15 years  
Gross Carrying Amount $ 3,500 3,500
Accumulated Amortization (1,944) (1,828)
Net $ 1,556 $ 1,672