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Basis of Presentation and Significant Accounting Policies - Concentrations of Credit Risk (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Credit Losses
Contractual life of accounts receivable	30 days
Period for analyzing historical loss data to determine loss experience	2 years
Provision for credit losses	$ 3,525	$ 2,567	$ 1,677
Trade Receivables | Credit Concentration Risk | Chevron, U.S.A. Inc.
Credit Losses
Concentration risk (as a percent)	14.00%
Trade Receivables | Credit Concentration Risk | Williams Partners
Credit Losses
Concentration risk (as a percent)	10.00%

X

- Definition

Period for analyzing historical loss data to determine loss experience, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Contractual life of accounts receivable, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

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