Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of Finite-Lived Intangible Assets

The following table summarizes the carrying value of our intangible assets as of December 31, 2017 and 2016:



	December 31,
In thousands	2017			2016
Intangible asset value	$	37,848		$	37,848
Accumulated amortization	(10,645		)	(8,215		)
Net book value	$	27,203		$	29,633

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

As of December 31, 2017, our estimated amortization expense for our intangible assets subject to amortization over the next five years is as follows:



In thousands
2018	$	2,430
2019	2,430
2020	2,430
2021	2,430
2022	2,430

Schedule of Earnings Per Share, Basic and Diluted Reconciliation

The following table sets forth the reconciliations of net income (loss) and weighted average shares used for purposes of calculating basic and diluted net income (loss) per common share for the periods indicated:



	Year Ended December 31,
In thousands	2017		2016			2015
Numerator
Net income (loss) – basic	$	163,152	$	(976,177	)	$	(4,385,448	)
Effect of potentially dilutive securities
Interest on convertible senior notes	49		—			—
Net income (loss) – diluted	$	163,201	$	(976,177	)	$	(4,385,448	)

Denominator
Weighted average common shares outstanding – basic	390,928		373,859			348,802
Effect of potentially dilutive securities
Restricted stock, stock options, SARs and performance-based equity awards	2,242		—			—
Convertible senior notes	2,751		—			—
Weighted average common shares outstanding – diluted	395,921		373,859			348,802

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following securities could potentially dilute earnings per share in the future, but were excluded from the computation of diluted net income (loss) per share, as their effect would have been antidilutive:



	Year Ended December 31,
In thousands	2017	2016	2015
Stock options and SARs	4,512	6,427	9,619
Restricted stock and performance-based equity awards	5,645	5,816	3,867