Earnings per Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Income (loss) from continuing operations		$ 20,876	$ (297)	$ (6,779)	$ (218,844)
Numerator:
(Loss) income from discontinued operations, net of tax		(1,020)	(3,032)	(4,906)	7,032
Net income (loss)		$ 19,856	$ (3,329)	$ (11,685)	$ (211,812)
Denominator:
Weighted-average shares used in basic EPS (in shares)		173,970,000	171,478,000	173,367,000	171,167,000
Dilutive effect of common stock equivalents (in shares)		5,009,000	0	0	0
Weighted-average shares used in diluted EPS (in shares)		178,979,000	171,478,000	173,367,000	171,167,000
Basic earnings (loss) per share:
Continuing operations (in dollars per share)	[1]	$ 0.12	$ 0	$ (0.04)	$ (1.28)
Discontinued operations (in dollars per share)	[1]	(0.01)	(0.02)	(0.03)	0.04
Net (loss) income (in dollars per share)	[1]	0.11	(0.02)	(0.07)	(1.24)
Diluted earnings (loss) per share:
Continuing operations (in dollars per share)	[1]	0.12	0	(0.04)	(1.28)
Discontinued operations (in dollars per share)	[1]	(0.01)	(0.02)	(0.03)	0.04
Net (loss) income (in dollars per share)	[1]	$ 0.11	$ (0.02)	$ (0.07)	$ (1.24)
Common stock equivalents excluded from calculation of diluted earnings per share because their impact would be anti-dilutive (in shares)		6,451,000	19,963,000	6,451,000	18,297,000
Dilutive effect of common stock equivalents			1,019	5,382	1,190,000

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