Net Income per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Earnings Per Share, Diluted [Line Items]
Net income (loss) attributable to shareholders		$ (548,966)	$ 169,915	$ (408,231)	$ 309,009
Weighted-average shares outstanding - basic		84,652	87,802	85,022	87,878
Net effect of various dilutive stock-based compensation awards		0	850	0	963
Weighted-average shares outstanding - diluted		84,652	88,652	85,022	88,841
Net income (Loss) per share:
Basic		$ (6.48)	$ 1.94	$ (4.80)	$ 3.52
Diluted	[1]	$ (6.48)	$ 1.92	$ (4.80)	$ 3.48
Document Period End Date				Jun. 29, 2019
Stock Compensation Plan [Member]
Net income (Loss) per share:
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			915		515

[1] Stock-based compensation awards for the issuance of 915 and 515 shares for the second quarter and first six months of 2018, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.