Net Income Per Share - Calculation of Basic and Diluted Net Loss per share Attributable (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019	Jun. 30, 2014
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income attributable to stockholders	$ 19,378	$ 121,459	$ 17,947	$ 31,735
Basic (shares)	170,003,000	142,471,000	169,413,000	142,095,000
Basic net income per share	$ 0.11	$ 0.85	$ 0.11	$ 0.22
Net income attributable to stockholders	$ 19,378	$ 121,459	$ 17,947	$ 31,735
Net income available to common stockholders	$ 19,913	$ 125,508	$ 17,947	$ 31,735
Diluted (shares)	178,118,000	166,837,000	170,971,000	143,062,000
Dilutive net income per share	$ 0.11	$ 0.75	$ 0.10	$ 0.22
4.00% debentures due 2023
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Interest on Convertible Debt, Net of Tax	$ 0	$ 3,358	$ 0	$ 0
0.875% debentures due 2021
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Interest on Convertible Debt, Net of Tax	$ 535	$ 691	$ 0	$ 0
Restricted stock units
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Restricted stock units (in shares)	1,765,000	2,241,000	1,558,000	967,000
0.875% debentures due 2021
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Restricted stock units (in shares)	6,350,000	8,203,000	0	0
Interest rate	0.875%		0.875%
4.00% debentures due 2023
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Restricted stock units (in shares)	0	13,922,000	0	0
Interest rate	4.00%		4.00%
0.875% debentures due 2021
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Interest rate	0.875%		0.875%		0.875%