Earnings per Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021		Mar. 31, 2020
Earnings Per Share [Abstract]
Loss from continuing operations	$ (27,655)		$ (218,547)
Numerator:
(Loss) income from discontinued operations, net of tax	(3,886)		10,064
Net loss	$ (31,541)		$ (208,483)
Denominator:
Weighted-average shares used in basic EPS (in shares)	172,856,000		170,912,000
Dilutive effect of common stock equivalents (in shares)	0		0
Weighted-average shares used in diluted EPS (in shares)	172,856,000		170,912,000
Basic earnings (loss) per share:
Continuing operations (in dollars per share)	$ (0.16)		$ (1.28)
Discontinued operations (in dollars per share)	(0.02)		0.06
Net (loss) income (in dollars per share)	(0.18)	[1]	(1.22)
Diluted earnings (loss) per share:
Continuing operations (in dollars per share)	(0.16)		(1.28)
Discontinued operations (in dollars per share)	(0.02)		0.06
Net (loss) income (in dollars per share)	$ (0.18)		$ (1.22)
Common stock equivalents excluded from calculation of diluted earnings per share because their impact would be anti-dilutive (in shares)	6,440,000		17,617,000
Dilutive effect of common stock equivalents	5,804		1,554,000

[1] The sum of the earnings per share amounts may not equal the totals due to rounding.