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Long-Lived Asset Impairment (Details) hp in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) compressor_unit hp | Jun. 30, 2015 USD ($) compressor_unit hp | Jun. 30, 2016 USD ($) compressor_unit hp | Jun. 30, 2015 USD ($) compressor_unit hp
Idle compressor units |  |  |  |
Long-Lived Asset Impairment |  |  |  |
Number of long-lived assets that the entity determined to retire and either sell or re-utilize key components | compressor_unit | 130 | 60 | 210 | 130
Horsepower retired from the contract operations business (in horsepower) | hp | 39 | 35 | 72 | 58
Long-lived asset impairment | $ 10.7 | $ 8.5 | $ 20.6 | $ 16.7
Previously impaired assets |  |  |  |
Long-Lived Asset Impairment |  |  |  |
Long-lived asset impairment |  | $ 1.0 |  | $ 1.0
Held-for-sale |  |  |  |
Long-Lived Asset Impairment |  |  |  |
Long-lived asset impairment | $ 3.1 |  | $ 3.1 |

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