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Long-Lived Asset Impairment | 9 Months Ended
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Sep. 30, 2018
Asset Impairment Charges [Abstract] |
Long-Lived Asset Impairment | 11. Long-Lived Asset Impairment We review long-lived assets, including property, plant and equipment and identifiable intangibles that are being amortized, for impairment whenever events or changes in circumstances, including the removal of compressor units from our active fleet, indicate that the carrying amount of an asset may not be recoverable. We periodically review the future deployment of our idle compression assets for units that are not of the type, configuration, condition, make or model that are cost efficient to maintain and operate. Based on these reviews, we determine that certain idle compressor units should be retired from the active fleet. The retirement of these units from the active fleet triggers a review of these assets for impairment and as a result of our review, we may record an asset impairment to reduce the book value of each unit to its estimated fair value. The fair value of each unit is estimated based on the expected net sale proceeds compared to other fleet units we recently sold, a review of other units recently offered for sale by third parties or the estimated component value of the equipment we plan to use. In connection with our review of our idle compression assets, we evaluate for impairment idle units that were culled from our fleet in prior years and are available for sale. Based on that review, we may reduce the expected proceeds from disposition and record additional impairment to reduce the book value of each unit to its estimated fair value. The following table presents the results of our impairment review as recorded in our contract operations segment (dollars in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Idle compressor units retired from the active fleet | 60 |  |  | 50 |  |  | 225 |  |  | 190 |
Horsepower of idle compressor units retired from the active fleet | 23,000 |  |  | 20,000 |  |  | 73,000 |  |  | 71,000 |
Impairment recorded on idle compressor units retired from the active fleet | $ | 6,660 |  |  | $ | 5,934 |  |  | $ | 18,323 |  |  | $ | 19,686 |
In addition to the impairment discussed above, during the three and nine months ended September 30, 2017, $0.8 million of leasehold improvements and furniture and fixtures were impaired in conjunction with the relocation of our corporate office during the third quarter of 2017. See Note 13 (“Corporate Office Relocation”) for further details.

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- Definition The entire disclosure for the details of the charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. Disclosure may also include a description of the impaired asset and facts and circumstances leading to the impairment, amount of the impairment loss and where the loss is located in the income statement, method(s) for determining fair value, and the segment in which the impaired asset is reported. + References No definition available. + Details
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