Net Income (Loss) Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

	Year ended December 31,
In thousands except per share amounts	2017			2016		2015
Net income (loss) available to common stockholders:
Income (loss) from continuing operations	$	10,925		$	22,435	$	(287,811	)
Income (loss) from discontinued operations	(12,244		)	32,917		(79,372		)
	$	(1,319	)	$	55,352	$	(367,183	)
Weighted average shares:
Basic	180,096			159,853		129,639
Effect of stock-based compensation plans	4,048			3,606		—
Diluted	184,144			163,459		129,639
Basic income (loss) per share:
Income (loss) from continuing operations	$	0.06		$	0.14	$	(2.22	)
Income (loss) from discontinued operations	(0.07		)	0.21		(0.61		)
Basic	$	(0.01	)	$	0.35	$	(2.83	)
Diluted income (loss) per share:
Income (loss) from continuing operations	$	0.06		$	0.14	$	(2.22	)
Income (loss) from discontinued operations	(0.07		)	0.20		(0.61		)
Diluted	$	(0.01	)	$	0.34	$	(2.83	)