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Revenue Recognition (Tables) | 9 Months Ended
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Sep. 30, 2019
Revenue Recognition |
Disaggregation of revenue by type of service | The following table disaggregates our revenue by type of service (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ |  | 2019 |  | 2018 |  | 2019 |  | 2018
Contract operations revenue | ​ | $ | 169,911 | ​ | $ | 162,895 | ​ | $ | 507,194 | ​ | $ | 396,134
Retail parts and services revenue | ​ | ​ | 5,845 | ​ | ​ | 6,052 | ​ | ​ | 12,983 | ​ | ​ | 16,241
Total revenues | ​ | $ | 175,756 | ​ | $ | 168,947 | ​ | $ | 520,177 | ​ | $ | 412,375
Disaggregation of revenue by timing of transfer of services | The following table disaggregates our revenue by timing of provision of services or transfer of goods (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ |  | 2019 |  | 2018 |  | 2019 |  | 2018
Services provided or goods transferred at a point in time | ​ | $ | 5,845 | ​ | $ | 6,052 | ​ | $ | 12,983 | ​ | $ | 16,241
Services provided over time: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Primary term | ​ | ​ | 114,121 | ​ | ​ | 84,620 | ​ | ​ | 316,809 | ​ | ​ | 199,027
Month-to-month | ​ | ​ | 55,790 | ​ | ​ | 78,275 | ​ | ​ | 190,385 | ​ | ​ | 197,107
Total revenues | ​ | $ | 175,756 | ​ | $ | 168,947 | ​ | $ | 520,177 | ​ | $ | 412,375
​

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