Long-Lived Asset Impairment (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) CompressorUnit hp	Jun. 30, 2014 USD ($) CompressorUnit hp	Jun. 30, 2015 USD ($) CompressorUnit hp	Jun. 30, 2014 USD ($) CompressorUnit hp
Long-lived asset impairment
Long-lived asset impairment	$ 1,826	$ 1,991	$ 5,310	$ 4,477
Idle compressor units
Long-lived asset impairment
Number of long-lived assets to be retired | CompressorUnit	20	40	50	65
Horsepower of long-lived assets to be retired | hp	6,000	8,000	17,000	15,000
Long-lived asset impairment	$ 1,400	$ 2,000	$ 4,900	$ 4,500
Other long lived assets
Long-lived asset impairment
Long-lived asset impairment	$ 400		$ 400