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Revenue Recognition (Disaggregated Revenue) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | $ 584,352 | $ 276,671 | $ 263,937
Services provided or goods transferred at a point in time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 20,936 | 10,541 | 8,377
Recurring term contracts: Primary Term |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 288,299 | 128,864 | 158,313
Recurring term contracts: Month-to-month |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 275,117 | 137,266 | 97,247
Contract operations revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 563,416 | 266,130 | 255,560
Retail parts and services revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | $ 20,936 | $ 10,541 | $ 8,377

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