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Business Acquisitions - March 2016 Acquisition (Narratives) (Details)
hp in Thousands, $ in Thousands
6 Months Ended
Mar. 01, 2016
USD ($)
customer
compressor_unit
hp
shares
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Nov. 03, 2015
USD ($)
Business Acquisitions        
Payment for business acquisition   $ 13,779 $ 0  
Long-term line of credit       $ 350,000
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      
Transaction costs   $ 200    
Property, plant and equipment useful life 15 years      
Limited Partner Units | March 2016 Acquisition        
Business Acquisitions        
Partners' capital account, units distributed in acquisition (units) | shares 257,000      
Partners' capital account acquisition, value $ 1,800      
General Partner | March 2016 Acquisition        
Business Acquisitions        
Partners' capital account, units distributed in acquisition (units) | shares 5,205      
General partner units interest (as a percentage) 2.00%