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

12 Months Ended

Dec. 31, 2015

Basis of Presentation and Significant Accounting Policies [Abstract]

Comprehensive Income (Loss) [Table Text Block]

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

	Derivative Adjustments (1)			Pension Liability Adjustments
	(in thousands)
For the year ended December 31, 2013
Net actuarial gain				$	2,766
Reclassification to earnings	$	1,777		1,239
Tax expense	(662		)	(1,522		)
Income, net of tax	$	1,115		$	2,483
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	)

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⁽¹⁾ As of December 31, 2013, all commodity derivative contracts that had been previously designated as cash flow hedges had settled and had been reclassified into earnings from AOCL.

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

The following table details the weighted-average dilutive and anti-dilutive securities related to RSUs, PSUs, and stock options for the years presented:

	For the Years Ended December 31,
	2015	2014	2013
	(in thousands)
Dilutive	—	814	1,383
Anti-dilutive	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,
	2015			2014		2013
	(in thousands, except per share amounts)
Net income (loss)	$	(447,710	)	$	666,051	$	170,935
Basic weighted-average common shares outstanding	67,723			67,230		66,615
Add: dilutive effect of stock options, unvested RSUs, and contingent PSUs (1)	—			814		1,383
Diluted weighted-average common shares outstanding	67,723			68,044		67,998
Basic net income (loss) per common share	$	(6.61	)	$	9.91	$	2.57
Diluted net income (loss) per common share	$	(6.61	)	$	9.79	$	2.51

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