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

12 Months Ended

Dec. 31, 2014

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 stock options, RSUs, PSUs, and the 3.50% Senior Convertible Notes for the years presented:



	For the Years Ended December 31,
	2014	2013	2012
	(in thousands)
Dilutive	814	1,383	—
Anti-dilutive	—	—	2,102

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,
	2014		2013		2012
	(in thousands, except per share amounts)
Net income (loss)	$	666,051	$	170,935	$	(54,249	)
Basic weighted-average common shares outstanding	67,230		66,615		65,138
Add: dilutive effect of stock options, unvested RSUs, and contingent PSUs	814		1,383		—
Add: dilutive effect of 3.50% Senior Convertible Notes ⁽¹⁾	—		—		—
Diluted weighted-average common shares outstanding	68,044		67,998		65,138
Basic net income (loss) per common share	$	9.91	$	2.57	$	(0.83	)
Diluted net income (loss) per common share	$	9.79	$	2.51	$	(0.83	)

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(1) For the year ended December 31, 2012, the shares into which the 3.50% Senior Convertible Notes were convertible were anti-dilutive and excluded from the calculation of diluted earnings per share.

Schedule of 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			Pension Liability Adjustments
	(in thousands)
For the year ended December 31, 2012
Net actuarial loss				$	(4,680	)
Reclassification to earnings	$	(3,865	)	771
Tax benefit	1,601			1,439
Loss, net of tax	$	(2,264	)	$	(2,470	)
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	)