Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of Major Customers [Table Text Block]

The Company had the following major customers and sales to entities under common ownership, which accounted for 10 percent or more of its total oil, gas, and NGL production revenue for at least one of the periods presented:



	For the Years Ended December 31,
	2017		2016		2015
Major customer #1⁽¹⁾	10	%	5	%	4	%
Major customer #2⁽²⁾	7	%	18	%	21	%
Group #1 of entities under common ownership⁽³⁾	17	%	15	%	10	%
Group #2 of entities under common ownership ⁽³⁾	8	%	8	%	11	%

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⁽¹⁾	This major customer is a purchaser of the Company’s production from its Permian region.

⁽²⁾

This major customer was the operator of the Company’s outside-operated Eagle Ford shale program, which was divested of during the first quarter of 2017. Prior to the divestiture, the Company was party to various marketing agreements, which included certain gathering, transportation, and processing throughput commitments. Because the Company shared with the operator the risk of non-performance by its counterparty purchasers, the Company included the operator as a major customer in the table above. Several of the operator’s counterparty purchasers under these contracts were also direct purchasers of the Company’s production from other areas.


⁽³⁾	In the aggregate these groups of entities under common ownership represent more than 10 percent of total oil, gas, and NGL production revenue for the period(s) shown, however, none of the individual entities comprising either group represented more than 10 percent of the Company’s total oil, gas, and NGL production revenue.

Schedule of Weighted-Average Anti-Dilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

The following table details the weighted-average anti-dilutive securities for the years presented:



	For the Years Ended December 31,
	2017	2016	2015
	(in thousands)
Anti-dilutive	264	280	256

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The following table sets forth the calculations of basic and diluted net loss per common share:



	For the Years Ended December 31,
	2017			2016			2015
	(in thousands, except per share data)
Net loss	$	(160,843	)	$	(757,744	)	$	(447,710	)
Basic weighted-average common shares outstanding	111,428			76,568			67,723
Add: dilutive effect of non-vested RSUs and contingent PSUs	—			—			—
Add: dilutive effect of Senior Convertible Notes	—			—			—
Diluted weighted-average common shares outstanding	111,428			76,568			67,723
Basic net loss per common share	$	(1.44	)	$	(9.90	)	$	(6.61	)
Diluted net loss per common share	$	(1.44	)	$	(9.90	)	$	(6.61	)

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

The December 31, 2016, and 2015 accompanying statements of cash flows line items that were adjusted as a result of the adoption of ASU 2016-15 and ASU 2016-18 are summarized as follows:



	For the Years Ended December 31,
	2016						2015
	As Reported			As Adjusted			As Reported			As Adjusted
	(in thousands)
Non-cash (gain) loss on extinguishment of debt	$	(15,722	)	N/A			$	4,123		N/A
(Gain) loss on extinguishment of debt	N/A			$	(15,722	)	N/A			$	16,578
Net cash provided by operating activities	$	552,804		$	552,804		$	978,352		$	990,807

Other, net	$	(3,000	)	$	—		$	(985	)	$	(985	)
Net cash used in investing activities	$	(1,870,639	)	$	(1,867,639	)	$	(1,144,639	)	$	(1,144,639	)

Cash paid for extinguishment of debt	N/A			$	—		N/A			$	(12,455	)
Net cash provided by financing activities	$	1,327,189		$	1,327,189		$	166,185		$	153,730

Net change in cash and cash equivalents	$	9,354		N/A			$	(102	)	N/A
Net change in cash, cash equivalents, and restricted cash	N/A			$	12,354		N/A			$	(102	)
Cash and cash equivalents at beginning of period	$	18		N/A			$	120		N/A
Cash, cash equivalents, and restricted cash at beginning of period	N/A			$	18		N/A			$	120
Cash and cash equivalents at end of period	$	9,372		N/A			$	18		N/A
Cash, cash equivalents, and restricted cash at end of period	N/A			$	12,372		N/A			$	18

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the accompanying balance sheets to the amounts shown in the accompanying statements of cash flows:



	December 31,
	2017		2016		2015
	(in thousands)
Cash and cash equivalents	$	313,943	$	9,372	$	18
Restricted cash ⁽¹⁾	—		3,000		—
Total cash, cash equivalents, and restricted cash shown in the accompanying statements of cash flows	$	313,943	$	12,372	$	18

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⁽¹⁾	Restricted cash is included in other noncurrent assets on the accompanying balance sheets.