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Long-Lived Asset Impairment (Details) hp in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) compressor_unit hp	Jun. 30, 2015 USD ($) compressor_unit hp	Jun. 30, 2016 USD ($) compressor_unit hp	Jun. 30, 2015 USD ($) compressor_unit hp
Idle compressor units
Long-Lived Asset Impairment
Number of long-lived assets that the entity determined to retire and either sell or re-utilize key components | compressor_unit	130	60	210	130
Horsepower retired from the contract operations business (in horsepower) | hp	39	35	72	58
Long-lived asset impairment	$ 10.7	$ 8.5	$ 20.6	$ 16.7
Previously impaired assets
Long-Lived Asset Impairment
Long-lived asset impairment		$ 1.0		$ 1.0
Held-for-sale
Long-Lived Asset Impairment
Long-lived asset impairment	$ 3.1		$ 3.1

X

- Definition

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

+ References

No definition available.

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- Definition

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

+ References

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- Definition

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+ References

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 958
-SubTopic 225
-Section 45
-Paragraph 11
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68048823&loc=d3e92212-112881

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Impairment
-URI http://asc.fasb.org/extlink&oid=6515133

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228

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