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Acquisitions Purchase Price Allocation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Apr. 01, 2015
Business Acquisition [Line Items]      
Goodwill $ 15,070 $ 14,548  
Gatherco [Member]      
Business Acquisition [Line Items]      
Business Combination, Consideration Transferred 57,658    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 53,203    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents 6,806   $ 6,800
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables 3,629    
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Assets Income Taxes Receivable 3,163    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets 425    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 67,226    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt 1,696   $ 1,696
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent 13,409    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable 3,837    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other 745    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities 19,687    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 47,539    
Goodwill $ 10,119