Earnings per Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Loss from continuing operations		$ (218,547)	$ (2,543)
Numerator:
Income (loss) from discontinued operations, net of tax		10,064	(116)
Net loss		(208,483)	(2,659)
Less: Preference stock dividend		0	8
Loss attributable to common stockholders (numerator for basic EPS)		$ (208,483)	$ (2,667)
Denominator:
Weighted-average shares used in basic EPS (in shares)		170,912,000	185,971,000
Dilutive effect of common stock equivalents (in shares)		0	0
Weighted-average shares used in diluted EPS (in shares)		170,912,000	185,971,000
Basic earnings (loss) per share:
Continuing operations (in dollars per share)	[1]	$ (1.28)	$ (0.01)
Discontinued operations (in dollars per share)	[1]	0.06	0
Net loss (in dollars per share)	[1]	(1.22)	(0.01)
Diluted earnings (loss) per share:
Continuing operations (in dollars per share)	[1]	(1.28)	(0.01)
Discontinued operations (in dollars per share)	[1]	0.06	0
Net loss income (in dollars per share)	[1]	$ (1.22)	$ (0.01)
Anti-dilutive options excluded from diluted earnings per share (in shares)		17,617,000	14,989,000
Dilutive effect of common stock equivalents		1,554,000	1,618,000

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