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Segments - Reconciliation of Revenues from Reportable Segments to Consolidated Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]                      
Revenues $ 19,333 $ 23,583 $ 30,424 $ 29,838 $ 17,002 $ 18,299 $ 32,836 $ 22,585 $ 103,178 $ 90,722 $ 151,178
Other revenues, including from other operating segments                      
Segment Reporting, Asset Reconciling Item [Line Items]                      
Revenues                 10,634 17,964 40,841
Elimination of intersegment revenues                      
Segment Reporting, Asset Reconciling Item [Line Items]                      
Revenues                 (5,624) (14,690) (2,561)
Total segment revenues from reportable segments                      
Segment Reporting, Asset Reconciling Item [Line Items]                      
Revenues                 $ 98,168 $ 87,448 $ 112,898