Long-Lived Asset Impairment (Details) - Idle compressor units hp in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018 USD ($) compressor_unit hp	Sep. 30, 2017 USD ($) compressor_unit hp	Sep. 30, 2018 USD ($) compressor_unit hp	Sep. 30, 2017 USD ($) compressor_unit hp
Impaired Long-Lived Assets Held and Used
Idle compressor units retired from the active fleet (compressors) \| compressor_unit	60	50	225	190
Horsepower of idle compressor units retired from the active fleet (horsepower) \| hp	23	20	73	71
Impairment recorded on idle compressor units retired from the active fleet \| $	$ 6,660	$ 5,934	$ 18,323	$ 19,686

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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