Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

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):

	December 31, 2016			December 31, 2015
Oil and natural gas properties:
Unproved	$	526,270		$	720,159
Proved		1,545,860			1,288,609
Gross oil and natural gas properties		2,072,130			2,008,768
Less accumulated depreciation depletion and    amortization		(1,131,378	)		(1,022,771	)
Oil and natural gas properties, net		940,752			985,997
Other property and equipment		11,447			10,753
Less accumulated depreciation		(4,699	)		(2,782	)
Other property and equipment, net		6,748			7,971
Property and equipment, net	$	947,500		$	993,968

Summary of Accrued Liabilities

A summary of accrued liabilities is as follows (in thousands):

	December 31, 2016		December 31, 2015
Ad valorem and production taxes	$	13,625	$	14,231
Employee compensation		4,257		6,628
Royalties		8,557		3,196
Short term derivatives		35,409		—
Other		2,302		1,407
Total accrued liabilities	$	64,150	$	25,462

Changes in Company's Asset Retirement Obligation Liability

The following table sets forth the changes in the Company’s ARO liability for the period indicated (in thousands):

	Year Ended
	December 31, 2016		December 31, 2015			December 31, 2014
Asset retirement obligations, beginning of period	$	3,401	$	17,400		$	9,055
Liabilities associated with assets held for sale		—		(19,057	)		—
Revisions of prior estimates		—		2,913			6,470
Additional liabilities incurred		1,014		522			1,084
Accretion		391		1,623			791
Asset retirement obligations, end of period	$	4,806	$	3,401		$	17,400

Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member]

Concentration Risk

The following table sets forth the Company’s major customers and associated percentage of revenue for the periods indicated:

	For the Year Ended December 31,
	2016			2015			2014
Purchaser
Antero Resources Corporation		14	%		19	%		47	%
ARM Energy Management		—			11	%		25	%
Concord Energy, LLC		12	%		—			—
Enlink Midstream Operating		17	%		21	%		—
Sequent Energy Management		20	%		19	%		—
Total		63	%		70	%		72	%

Accounts Receivable [Member] | Product Concentration Risk [Member]

Concentration Risk

The following table summarizes concentration of receivables, net of allowances, by product or service as of December 31, 2016 and December 31, 2015 (in thousands):

	December 31, 2016		December 31, 2015
Receivables by product or service:
Sale of oil and natural gas and related products    and services	$	41,398	$	19,858
Joint interest owners		2,065		3,095
Derivatives		122		4,523
Other		53		—
Total	$	43,638	$	27,476