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Revenue Recognition (Disaggregated Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 175,756 | $ 168,947 | $ 520,177 | $ 412,375
Services provided or goods transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 5,845 | 6,052 | 12,983 | 16,241
Recurring term contracts: Primary Term |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 114,121 | 84,620 | 316,809 | 199,027
Recurring term contracts: Month-to-month |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 55,790 | 78,275 | 190,385 | 197,107
Contract operations revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 169,911 | 162,895 | 507,194 | 396,134
Retail parts and services revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 5,845 | $ 6,052 | $ 12,983 | $ 16,241

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