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Long-Lived Asset Impairment (Details) hp in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) compressor_unit hp	Dec. 31, 2017 USD ($) compressor_unit hp	Dec. 31, 2016 USD ($) compressor_unit hp
Impaired Long-Lived Assets Held and Used
Long-lived asset impairment	$ 9,804	$ 6,660	$ 6,953	$ 4,710	$ 8,284	$ 7,105	$ 5,508	$ 8,245	$ 28,127	$ 29,142	$ 87,435
Held-for-sale
Impaired Long-Lived Assets Held and Used
Impairment recorded on idle compressor units retired from the active fleet									$ 0	$ 0	$ 10,742
Idle compressor units
Impaired Long-Lived Assets Held and Used
Idle compressor units retired from the active fleet (compressors) | compressor_unit									310	325	655
Horsepower of idle compressor units retired from the active fleet (horsepower) | hp									115	100	262
Impairment recorded on idle compressor units retired from the active fleet									$ 28,127	$ 26,287	$ 76,693

X

- Definition

The number of long-lived assets that the entity determined to retire and either sell or re-utilize key components.

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The capacity of long-lived assets that the entity determined to retire and either sell or re-utilize key components, expressed in horsepower.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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