Net Income (Loss) Per Share - (Reconciliation Of The Numerator And Denominator Of Basic And Diluted Net Loss Per Share) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
(Loss) income from continuing operations	$ 17,610		$ (98,052)		$ 175,191	$ (110,664)
Loss from discontinued operations, net of tax	(7,052)		(7,953)		(34,703)	(13,914)
NET INCOME (LOSS)	$ 10,558	$ 129,930	$ (106,005)	$ (18,573)	$ 140,488	$ (124,578)
Denominator:
For basic per share data—weighted average shares (in shares)	229,716		226,221		228,457	225,408
Dilutive effect of ordinary share equivalents (in shares)	3,965		0		4,891	0
For diluted per share data—weighted average shares (in shares)	233,681		226,221		233,348	225,408
Stock Options
Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)	7,100				7,200
Stock Award
Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)	6,600				5,900