Earnings per Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
(Loss) income from continuing operations		$ (297)	$ 29,310	$ (218,844)	$ 26,767
Numerator:
(Loss) income from discontinued operations, net of tax		(3,032)	(5,613)	7,032	(5,729)
Net (loss) income		(3,329)	23,697	(211,812)	21,038
Less: Preference stock dividend		0	0	0	8
(Loss) income attributable to common stockholders (numerator for basic EPS)		$ (3,329)	$ 23,697	$ (211,812)	$ 21,030
Denominator:
Weighted-average shares used in basic EPS (in shares)		171,478,000	177,192,000	171,167,000	181,446,000
Dilutive effect of common stock equivalents (in shares)		0	1,089,000	0	1,192,000
Weighted-average shares used in diluted EPS (in shares)		171,478,000	178,281,000	171,167,000	182,638,000
Basic earnings (loss) per share:
Continuing operations (in dollars per share)	[1]	$ 0	$ 0.17	$ (1.28)	$ 0.15
Discontinued operations (in dollars per share)	[1]	(0.02)	(0.03)	0.04	(0.03)
Net (loss) income (in dollars per share)	[1]	(0.02)	0.13	(1.24)	0.12
Diluted earnings (loss) per share:
Continuing operations (in dollars per share)	[1]	0	0.16	(1.28)	0.15
Discontinued operations (in dollars per share)	[1]	(0.02)	(0.03)	0.04	(0.03)
Net (loss) income (in dollars per share)	[1]	$ (0.02)	$ 0.13	$ (1.24)	$ 0.12
Common stock equivalents excluded from calculation of diluted earnings per share because their impact would be anti-dilutive (in shares)		19,963,000	16,297,000	18,297,000	16,077,000
Dilutive effect of common stock equivalents		1,019,000		1,190,000

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