Earnings per Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Numerator:
Income (loss) from continuing operations									$ 3,507		$ (190,491)		$ 39,859
(Loss) income from discontinued operations, net of tax	$ (524)	$ 572	$ (1,020)	$ (3,886)	$ 2,467	$ 616	$ (3,032)	$ 10,064	(4,858)		10,115		154,460
Net (loss) income	$ 1,267	$ 9,067	$ 19,856	$ (31,541)	$ 20,266	$ 11,351	$ (3,506)	$ (208,487)	(1,351)		(180,376)		194,319
Less: Preference stock dividend									0		0		8
(Loss) income attributable to common stockholders (numerator for basic EPS)									$ (1,351)		$ (180,376)		$ 194,311
Denominator:
Weighted-average shares used in basic EPS (in shares)									173,914,000		171,519,000		176,251,000
Dilutive effect of common stock equivalents (shares)									5,191,000		0		1,198,000
Weighted-average shares used in diluted EPS (in shares)									179,105,000		171,519,000		177,449,000
Basic (loss) earnings per share:
Continuing operations (in dollars per share)	$ 0.01	$ 0.05	$ 0.12	$ (0.16)	$ 0.10	$ 0.06	$ 0	$ (1.28)	$ 0.02	[1]	$ (1.11)	[1]	$ 0.23	[1]
Discontinued operations (in dollars per share)	0	0	(0.01)	(0.02)	0.01	0	(0.02)	0.06	(0.03)	[1]	0.06	[1]	0.88	[1]
Net income (in dollars per share)	0.01	0.05	0.11	(0.18)	0.12	0.07	(0.02)	(1.22)	(0.01)	[1]	(1.05)	[1]	1.10	[1]
Diluted (loss) earnings per share:
Continuing operations (in dollars per share)	0.01	0.05	0.12	(0.16)	0.10	0.06	0	(1.28)	0.02	[1]	(1.11)	[1]	0.22	[1]
Discontinued operations (in dollars per share)	0	0	(0.01)	(0.02)	0.01	0	(0.02)	0.06	(0.03)	[1]	0.06	[1]	0.87	[1]
Net income (in dollars per share)	$ 0.01	$ 0.05	$ 0.11	$ (0.18)	$ 0.11	$ 0.06	$ (0.02)	$ (1.22)	$ (0.01)	[1]	$ (1.05)	[1]	$ 1.10	[1]
Anti-dilutive options excluded from diluted earnings per share (in shares)									6,514,000		11,626,000		15,751,000
Dilutive effect of common stock equivalents (shares)											2,483

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