Net Income Per Share - Calculation of Basic and Diluted Net Income (Loss) per share Attributable (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2021	Jun. 28, 2020	Jul. 04, 2021	Jun. 28, 2020	Dec. 31, 2015	Jun. 30, 2014
Numerator:
Net income attributable to stockholders - continuing operations	$ 75,207	$ 55,890	$ 26,822	$ 77,430
Net loss attributable to stockholders - discontinued operations	0	(36,512)	0	(59,483)
Net income attributable to stockholders	$ 75,207	$ 19,378	$ 26,822	$ 17,947
Denominator:
Basic weighted-average common shares (in shares)	172,640	170,003	171,920	169,413
Basic net income per share - continuing operations (in dollars per share)	$ 0.44	$ 0.33	$ 0.16	$ 0.46
Basic net loss per share - discontinued operations (in dollars per share)	0	(0.21)	0	(0.35)
Net income per share - basic (in dollars per share)	$ 0.44	$ 0.12	$ 0.16	$ 0.11
Numerator:
Net income attributable to stockholders - continuing operations	$ 75,207	$ 55,890	$ 26,822	$ 77,430
Net income available to common stockholders - continuing operations	78,400	59,783	26,990	78,470
Net loss attributable to stockholders - discontinued operations	$ 0	$ (36,512)	$ 0	$ (59,483)
Denominator:
Basic weighted-average common shares (in shares)	172,640	170,003	171,920	169,413
Effect of dilutive securities:
Dilutive weighted-average common shares (in shares)	194,363	192,040	176,794	179,174
Dilutive net income per share - continuing operations (in dollars per share)	$ 0.40	$ 0.31	$ 0.15	$ 0.44
Dilutive net loss per share - discontinued operations (in dollars per share)	0	(0.19)	0	(0.33)
Net income (loss) per share - diluted (in dollars per share)	$ 0.40	$ 0.12	$ 0.15	$ 0.11
Restricted stock units
Effect of dilutive securities:
Restricted stock units (in shares)	3,084	1,765	3,299	1,558
0.875% debentures due 2021
Effect of dilutive securities:
Convertible debt (in shares)	1,571	6,350	1,575	8,203
4.00% debentures due 2023
Effect of dilutive securities:
Convertible debt (in shares)	17,068	13,922	0	0
Interest rate	4.00%		4.00%
0.875% debentures due 2021
Numerator:
Interest on convertible debt	$ 67	$ 535	$ 168	$ 1,040
0.875% debentures due 2021 | Convertible debt:
Effect of dilutive securities:
Interest rate						0.875%
4.00% debentures due 2023
Numerator:
Interest on convertible debt	$ 3,126	$ 3,358	$ 0	$ 0
4.00% debentures due 2023 | Convertible debt:
Effect of dilutive securities:
Interest rate					4.00%