Earnings (Loss) Per Share - Reconciliation of the Numerator and Denominator of Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator [Abstract]
Income from continuing operations - numerator for earnings (loss) per share		$ 103,699	$ 16,751	$ 132,414	$ 42,227
Net income (loss)		102,767	(42,417)	130,260	(212,013)
Loss from discontinued operations - numerator for earnings (loss) per share		$ (932)	$ (59,168)	$ (2,154)	$ (254,240)
Denominator [Abstract]
Shares used for basic income (loss) per share		49,732	48,783	49,490	48,702
Effect of dilutive stock options and stock units outstanding [Abstract]
Shares used for diluted income (loss) per share		50,360	49,401	50,401	49,017
Earnings (loss) per share attributable to - basic [Abstract]
Continuing operations (in dollars per share)		$ 2.09	$ 0.34	$ 2.68	$ 0.87
Discontinued operations (in dollars per share)		(0.02)	(1.21)	(0.04)	(5.22)
Net income (loss)	[1]	2.07	(0.87)	2.63	(4.35)
Earnings (loss) per share - diluted [Abstract]
Continuing operations (in dollars per share)		2.06	0.34	2.63	0.86
Discontinued operations (in dollars per share)		(0.02)	(1.20)	(0.04)	(5.19)
Net income (loss)	[1]	$ 2.04	$ (0.86)	$ 2.58	$ (4.33)
Non-Qualified Stock Options
Effect of dilutive stock options and stock units outstanding [Abstract]
Effect of dilutive stock options and restricted stock units outstanding (in shares)		45	27	58	27
Restricted Stock Units (RSUs)
Effect of dilutive stock options and stock units outstanding [Abstract]
Effect of dilutive stock options and restricted stock units outstanding (in shares)		343	564	610	268
Market Stock Units
Effect of dilutive stock options and stock units outstanding [Abstract]
Effect of dilutive stock options and restricted stock units outstanding (in shares)		168		176
Performance-Based Stock Units
Effect of dilutive stock options and stock units outstanding [Abstract]
Effect of dilutive stock options and restricted stock units outstanding (in shares)		72	27	67	20
Market Stock Units
Earnings (loss) per share - diluted [Abstract]
Dilutive securities outstanding not included in the computation of earnings per share because their effect is anti-dilutive (in shares)			150		66
Non-Qualified Stock Options
Earnings (loss) per share - diluted [Abstract]
Dilutive securities outstanding not included in the computation of earnings per share because their effect is anti-dilutive (in shares)		213	110	228	154
Restricted Stock Units (RSUs)
Earnings (loss) per share - diluted [Abstract]
Dilutive securities outstanding not included in the computation of earnings per share because their effect is anti-dilutive (in shares)		65	95	25	314
Restricted Stock Awards
Earnings (loss) per share - diluted [Abstract]
Dilutive securities outstanding not included in the computation of earnings per share because their effect is anti-dilutive (in shares)			19		30
Performance-Based Stock Units
Earnings (loss) per share - diluted [Abstract]
Dilutive securities outstanding not included in the computation of earnings per share because their effect is anti-dilutive (in shares)					32

[1] Figures may not add due to rounding.