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Acquisitions - Gatherco purchase price allocation (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Apr. 01, 2015
Business Acquisition [Line Items]      
Goodwill $ 15,070 $ 14,548  
Gatherco [Member]      
Business Acquisition [Line Items]      
Purchase price 57,658    
Property plant and equipment 53,203    
Cash 6,806   $ 6,800
Accounts receivable 3,629    
Income taxes receivable 3,163    
Other assets 425    
Total assets acquired 67,226    
Long-term debt 1,696   1,696
Deferred income taxes 13,409    
Accounts payable 3,837    
Other current liabilities 745    
Total liabilities assumed 19,687    
Net identifiable assets acquired 47,539    
Goodwill $ 10,119   $ 11,100