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Segment Information (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
segment
Sep. 30, 2017
USD ($)
Segment Reporting Information [Line Items]        
Number of reportable segments | segment     2  
Revenues $ 64,598 $ 43,999 $ 195,042 $ 136,876
Intersegment Eliminations [Member]        
Segment Reporting Information [Line Items]        
Revenues     $ 0