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Summary of Significant Accounting Policies - Prior Period Adjustments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Spare parts and equipment sales | $ 24,409 | $ 11,529 | $ 56,497 | $ 36,168
Gain (loss) on sale of leased equipment | 4,589 | 1,065 | 19,279 | 1,662
Cost of spare parts and equipment sales | $ 20,195 | 8,832 | 47,192 | 30,524
Cash flows provided by operating activities |  |  | 170,817 | 115,528
Cash flows provided by financing activities |  |  | (89,204) | 285,712
Impacts from ASC 606 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Spare parts and equipment sales |  | 3,200 |  | 14,500
Gain (loss) on sale of leased equipment |  | (200) |  | (500)
Cost of spare parts and equipment sales |  | $ 3,000 |  | 14,000
Cash flows provided by operating activities |  |  |  | $ 14,700
Cash flows provided by financing activities |  |  | $ (14,700) |

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