Fair Value - Summary of Assets And Liabilities Measured at Fair Value (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jul. 01, 2018
Assets:
Cash equivalents	$ 619,600	$ 998,601	$ 691,983
Marketable securities	51,543	54,250	49,537
Derivatives	6,920	15,071	13,446
Assets, fair value	678,063	1,067,922	754,966
Liabilities:
Derivatives, liabilities	17,555	5,316	625
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	619,600	728,800	446,454
Marketable securities	51,543	44,243	49,537
Derivatives	0	0	0
Assets, fair value	671,143	773,043	495,991
Liabilities:
Derivatives, liabilities	0	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	0	269,801	245,529
Marketable securities	0	10,007	0
Derivatives	6,920	15,071	13,446
Assets, fair value	6,920	294,879	258,975
Liabilities:
Derivatives, liabilities	$ 17,555	$ 5,316	$ 625