Amount of horsepower of compressor units acquired during the period.

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Number of Customers

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Business Acquisitions - March 2016 Acquisition (Narratives) (Details) hp in Thousands, $ in Thousands	1 Months Ended	3 Months Ended								12 Months Ended
	Mar. 31, 2016 USD ($) customer compressor_unit hp shares	Dec. 31, 2018 USD ($)	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 ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisitions
Payment for business acquisition										$ 0	$ 0	$ 13,779
Merger-related costs		$ 169	$ 182	$ 5,686	$ 4,125	$ 275	$ 0	$ 0	$ 0	$ 10,162	$ 275	0
March 2016 Acquisition
Business Acquisitions
Number of customers \| customer	4
Number of compressor units acquired \| compressor_unit	19
Horsepower of compressor units acquired \| hp	23
Payment for business acquisition	$ 18,800
Long-term line of credit	$ 13,800
Number of like kind exchanged compressor (units) \| compressor_unit	24
Number of like kind exchanged compressor (units), value	$ 3,200
Merger-related costs												$ 200
Property, plant and equipment useful life	15 years
March 2016 Acquisition \| Limited Partner Units
Business Acquisitions
Partners' capital account, units distributed in acquisition (units) \| shares	257,000
Partners' capital account acquisition, value	$ 1,800
March 2016 Acquisition \| General Partner
Business Acquisitions
Partners' capital account, units distributed in acquisition (units) \| shares	5,205
General partner units interest (as a percentage)	2.00%