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Long-Lived Asset Impairment (Details) - Idle compressor units hp in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) compressor_unit hp	Jun. 30, 2017 USD ($) compressor_unit hp	Jun. 30, 2018 USD ($) compressor_unit hp	Jun. 30, 2017 USD ($) compressor_unit hp
Impaired Long-Lived Assets Held and Used
Idle compressor units retired from the active fleet (compressors) | compressor_unit	120	60	165	140
Horsepower of idle compressor units retired from the active fleet (horsepower) | hp	27	23	50	51
Impairment recorded on idle compressor units retired from the active fleet | $	$ 6,953	$ 5,508	$ 11,663	$ 13,753

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- 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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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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