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Organization and Summary of Significant Accounting Policies - Concentrations of Credit Risk (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Concentration Risk
Bad debt expense	$ 1,677	$ 5,144	$ 3,637
Trade Receivables | Customer Concentration Risk | Anadarko
Concentration Risk
Concentration risk (percent)	13.00%	10.00%
Trade Receivables | Customer Concentration Risk | Williams Partners
Concentration Risk
Concentration risk (percent)	11.00%	16.00%

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