Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 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):

	March 31, 2019			December 31, 2018
Oil and natural gas properties:
Unproved	$	557,583		$	482,475
Proved		2,511,575			2,188,233
Gross oil and natural gas properties		3,069,158			2,670,708
Less accumulated depreciation, depletion and    amortization		(1,409,803	)		(1,380,650	)
Oil and natural gas properties, net		1,659,355			1,290,058
Other property and equipment		21,662			14,460
Less accumulated depreciation		(8,516	)		(8,160	)
Other property and equipment, net		13,146			6,300
Property and equipment, net	$	1,672,501		$	1,296,358

Summary of Revenue Disaggregated by Type

The following table illustrates the revenue disaggregated by type for the three months ended March 31, 2019 and 2018:

	Three Months Ended March 31,
	2019		2018
Revenues (in thousands)
Natural gas sales	$	81,825	$	58,483
NGL sales		21,248		19,743
Oil sales		28,755		31,958
Brokered natural gas and marketing revenue		9,530		8
Other revenue		139		—
Total revenues	$	141,497	$	110,192

Concentration Risk

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

	March 31, 2019		December 31, 2018
Receivables by product or service:
Sale of oil and natural gas and related products    and services	$	83,188	$	94,107
Joint interest owners		35,559		24,830
Derivatives		1,878		372
Other		177		23
Total	$	120,802	$	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 three months ended March 31, 2019 (in thousands):

	Three Months Ended March 31, 2019
Asset retirement obligations, beginning of period	$	7,110
Accretion		347
Additional liabilities incurred		49
Obligation for wells acquired		20,188
Liabilities settled via plugging		(26	)
Less: current ARO portion (accrued liabilities)		(3,520	)
Asset retirement obligations, end of period	$	24,148