Concentration of Risk Accounts Receivable, net of Allowance for Doubtful Accounts (Tables)

12 Months Ended

Dec. 31, 2019

Concentration Risks, Types, No Concentration Percentage [Abstract]

Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block]

Other Accrued Expenses. The following table presents the components of other accrued expenses:

	As of December 31,
	2019		2018
	(in thousands)
Employee benefits	$	21,611	$	25,811
Asset retirement obligations	32,200		25,598
Environmental expenses	2,256		3,038
Operating and finance leases	5,926		1,779
Other	8,469		18,907
Other accrued expenses	$	70,462	$	75,133

Other Liabilities. The following table presents the components of other liabilities as of:

	As of December 31,
	2019		2018
	(in thousands)
Production taxes	$	68,020	$	61,310
Deferred oil gathering credits	20,100		22,710
Deferred midstream gathering credits	175,897		—
Operating and finance leases	15,779		2,900
Other	3,337		5,744
Other liabilities	$	283,133	$	92,664

Deferred Oil Gathering Credits. In January 2018, we entered into an agreement that dedicates crude oil from the majority of our Wattenberg Field acreage to the midstream provider's gathering lines and extends the term of the agreement through December 2029. The payment is being amortized over the life of the agreement. Amortization charges related to this deferred oil gathering credit totaling approximately $2.0 million and $1.4 million for 2019 and 2018, respectively, are included as a reduction to transportation, gathering and processing expenses.

Deferred Midstream Gathering Credits. In May 2019, concurrent with the sale of our Delaware Basin produced water gathering and disposal midstream assets, we entered into an agreement with the purchaser which dedicates all of our water gathering and disposal volumes in the Delaware Basin via pipeline for a term of 15 years. We recorded a long-term deferred credit of $40.5 million attributable to the value of the dedication, which is being amortized using the units-of-production basis. Amortization charges related to this deferred credit totaling $0.9 million for 2019 are included as a reduction to lease operating expenses and capital costs.

In May 2019, concurrent with the sale of our Delaware Basin crude oil gathering midstream assets, we entered into an agreement with the purchaser which provides us with gathering and transport for crude oil from dedicated acreage within an area of mutual interest for a term of 15 years. We recorded a long-term deferred credit of $28.9 million attributable to the value of the dedication, which is being amortized on a units-of-production basis. Amortization charges related to this deferred credit totaling $0.5 million for 2019 are included as crude oil sales.

In June 2019, concurrent with the sale of our Delaware Basin natural gas gathering midstream assets, we entered into an agreement with the purchaser which provides us with gathering, processing and transportation of our natural gas from certain dedicated leases for a term of 22 years. We recorded a long-term deferred credit of $110.2 million attributable to the value of the dedication, which is being amortized on a units-of-production basis. Amortization charges related to this deferred credit totaling $2.0 million for 2019 are included as a reduction to transportation, gathering and processing expenses.

Accounts Receivable [Table Text Block]

Accounts Receivable. The following table presents the components of accounts receivable, net of allowance for doubtful accounts:

	As of December 31,
	2019			2018
	(in thousands)
Crude oil, natural gas and NGLs sales	$	149,758		$	155,756
Joint interest billings	29,510			19,580
Midstream asset divestitures deferred payments	81,702			—
Derivative counterparties	—			3,937
Other	12,860			6,542
Allowance for doubtful accounts	(7,476		)	(4,381		)
Accounts receivable, net	$	266,354		$	181,434

Individual Customers Constituting 10% or more of Total Revenue [Table Text Block]

Major Customers. The following table presents the individual customers constituting 10 percent or more of total revenues:

	Year Ended December 31,
Customer	2019		2018		2017
Occidental Marketing, Inc.	20.0	%	—	%	—	%
DCP Midstream, LP	17.0	%	12.5	%	19.6	%
Mercuria Energy Trading, Inc.	16.0	%	—	%	—	%
United Energy Trading, LLC	11.0	%	—	%	—	%
Suncor Energy Marketing, Inc.	—	%	—	%	16.4	%