Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2015

Calculation of Net Income (Loss) and Number of Shares Used to Compute Basic and Diluted Earnings Per Share

The calculation of net loss and the number of shares used to compute basic and diluted earnings per share for the years ended December 31, 2015, 2014 and 2013 are as follows:

In thousands, except per share amounts	2015			2014			2013
Net loss	$	(231,156	)	$	(162,602	)	$	(274,158	)
Weighted average shares outstanding – basic and diluted		188,669			186,835			183,575
Net loss per share – basic and diluted	$	(1.23	)	$	(0.87	)	$	(1.49	)

Potentially Dilutive Securities Excluded in Computation of Net Loss Per Share

For the years ended December 31, 2015, 2014 and 2013, the following potentially dilutive securities were not included in the computation of net loss per share because the effect would be anti-dilutive:

In thousands	2015		2014		2013
Stock options		10,233		10,148		10,380
Restricted stock and restricted stock units		4,493		3,503		2,048
Convertible notes		21,500		21,500		—
Warrants		21,500		21,500		—
		57,726		56,651		12,428