Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements for Investments

Following is a summary of fair value measurements for investments as of June 30, 2018 and December 30, 2017:

	Fair Value		Level 1	Level 2	Level 3
	(Amounts are in thousands)
June 30, 2018	$	6,628,889	2,774,860	3,854,029	—
December 30, 2017	6,433,311		2,545,320	3,887,991	—