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Acquisitions Purchase Price Allocation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Apr. 01, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Goodwill $ 14,548   $ 4,952
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 53,202    
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 3,012    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets 247    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 66,896    
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 12,987    
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 314    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities 18,834    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 48,062    
Goodwill $ 9,596 $ 11,100