Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Summary of Property and Equipment Including Oil and Natural Gas Properties

A summary of property and equipment including oil and natural gas properties is as follows (in thousands):

	September 30, 2019			December 31, 2018
Oil and natural gas properties:
Unproved	$	520,941		$	482,475
Proved		2,702,202			2,188,233
Gross oil and natural gas properties		3,223,143			2,670,708
Less accumulated depreciation, depletion and    amortization		(1,491,326	)		(1,380,650	)
Oil and natural gas properties, net		1,731,817			1,290,058
Other property and equipment		21,935			14,460
Less accumulated depreciation		(9,586	)		(8,160	)
Other property and equipment, net		12,349			6,300
Property and equipment, net	$	1,744,166		$	1,296,358

Summary of Revenue Disaggregated by Type

The following table illustrates the revenue disaggregated by type for the three and nine months ended September 30, 2019 and 2018:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Revenues (in thousands)
Natural gas sales	$	87,841	$	65,756	$	264,030	$	178,648
NGL sales		20,200		25,074		60,841		63,520
Oil sales		44,980		36,349		103,407		98,452
Brokered natural gas and marketing revenue		10,228		2,944		31,747		3,318
Other revenue		46		—		307		—
Total revenues	$	163,295	$	130,123	$	460,332	$	343,938

Concentration Risk

The following table summarizes the Company’s concentration of receivables, net of allowances (if any), by product or service as of September 30, 2019 and December 31, 2018 (in thousands):

	September 30, 2019		December 31, 2018
Receivables by product or service:
Sale of oil and natural gas and related products    and services	$	57,245	$	94,107
Joint interest owners		16,305		24,830
Derivatives		366		372
Other		3,238		23
Total	$	77,154	$	119,332

Changes in Company's Asset Retirement Obligation Liability

The following table sets forth the changes in the Company’s ARO liability for the nine months ended September 30, 2019 (in thousands):

	Nine Months Ended September 30, 2019
Asset retirement obligations, beginning of period	$	7,110
Accretion		1,688
Additional liabilities incurred		267
Obligation for wells acquired		20,188
Obligation for wells drilled		445
Liabilities settled via plugging		(387	)
Less: current ARO portion (accrued liabilities)		(2,142	)
Asset retirement obligations, end of period	$	27,169