Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

Basis of Presentation and Significant Accounting Policies [Abstract]

Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]

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



	For the Years Ended December 31,
	2016		2015		2014
Major customer⁽¹⁾	18	%	21	%	19	%
Group #1 of entities under common ownership⁽²⁾	15	%	10	%	14	%
Group #2 of entities under common ownership ⁽²⁾	8	%	11	%	9	%

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⁽¹⁾

This major customer is the operator of the Company’s outside-operated Eagle Ford shale program, in which the Company entered into various marketing agreements with during 2013, whereby the Company is subject to certain gathering, transportation, and processing throughput commitments for up to 10 years pursuant to each contract. Because the Company shares with its operator the risk of non-performance by its counterparty purchasers, the Company has included its operator as a major customer in the table above. Several of the operator’s counterparty purchasers under these contracts are also direct purchasers of the Company’s production from other areas. As of December 31, 2016, the Company’s outside-operated Eagle Ford shale assets were classified as held for sale.


⁽²⁾	In the aggregate these groups of entities under common ownership represent more than 10 percent of total production revenue for the period(s) shown, however, none of the entities comprising either group individually represented more than 10 percent of the Company’s production revenue.

Dilutive and Anti-Dilutive Shares for Earnings per Share [Table Text Block]

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



	For the Years Ended December 31,
	2016	2015	2014
	(in thousands)
Dilutive	—	—	814
Anti-dilutive	280	256	—

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

The following table sets forth the calculations of basic and diluted earnings per share:



	For the Years Ended December 31,
	2016			2015			2014
	(in thousands, except per share amounts)
Net income (loss)	$	(757,744	)	$	(447,710	)	$	666,051
Basic weighted-average common shares outstanding	76,568			67,723			67,230
Add: dilutive effect of unvested RSUs, contingent PSUs, and stock options ⁽¹⁾	—			—			814
Add: dilutive effect of 1.50% Senior Convertible Notes ⁽²⁾	—			—			—
Diluted weighted-average common shares outstanding	76,568			67,723			68,044
Basic net income (loss) per common share	$	(9.90	)	$	(6.61	)	$	9.91
Diluted net income (loss) per common share	$	(9.90	)	$	(6.61	)	$	9.79

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⁽¹⁾	For the years ended December 31, 2016, and 2015, the shares were anti-dilutive and excluded from the calculation of diluted earnings per share.


⁽²⁾	For the year ended December 31, 2016, shares of the Company’s common stock traded at an average closing price below the $40.50 conversion price, and therefore, had no dilutive impact and were excluded from the calculation of diluted earnings per share.

Comprehensive Income (Loss) [Table Text Block]

The changes in the balances of components comprising other comprehensive income (loss) are presented in the following table:



	Pension Liability Adjustments
	(in thousands)
For the year ended December 31, 2014
Net actuarial loss	$	(10,062	)
Reclassification to earnings	706
Tax benefit	3,460
Loss, net of tax	$	(5,896	)
For the year ended December 31, 2015
Net actuarial loss	$	(4,990	)
Reclassification to earnings	1,853
Tax benefit	1,047
Loss, net of tax	$	(2,090	)
For the year ended December 31, 2016
Net actuarial loss	$	(3,322	)
Reclassification to earnings	1,598
Tax benefit	570
Loss, net of tax	$	(1,154	)