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Segments - Reconciliation of Revenues from Reportable Segments to Consolidated Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting, Asset Reconciling Item [Line Items]        
Revenues from external customers $ 30,424 $ 32,836 $ 60,262 $ 55,421
Other revenues, including from other operating segments        
Segment Reporting, Asset Reconciling Item [Line Items]        
Revenues 2,526 4,097 5,740 8,315
Elimination of intersegment revenues        
Segment Reporting, Asset Reconciling Item [Line Items]        
Revenues (2,106) (3,200) (5,207) (6,294)
Total segment revenues from reportable segments        
Segment Reporting, Asset Reconciling Item [Line Items]        
Revenues $ 30,004 $ 31,939 $ 59,729 $ 53,400