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Acquisitions Purchase Price Allocation (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 01, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned   $ 0 $ 0 $ 30,164
Goodwill   22,104 15,070  
Payments to Acquire Businesses, Gross   $ 11,945 $ 0 20,930
Gatherco [Member]        
Business Acquisition [Line Items]        
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned $ 30,200     30,164
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 (6,800)     (6,806)
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
Payments to Acquire Businesses, Gross $ 27,500     27,494
Net [Member] | Gatherco [Member]        
Business Acquisition [Line Items]        
Business Combination, Consideration Transferred       52,548
Gross [Member] | Gatherco [Member]        
Business Acquisition [Line Items]        
Business Combination, Consideration Transferred       $ 59,354