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Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2018

Marketable Securities [Abstract]

Schedule of available-for-sale securities

Available-for-sale securities measured at fair value on a recurring basis are summarized below: 

		Fair Value Measurements as of March 31, 2018
		Total				Level 1				Level 2				Level 3
U.S. Treasury securities		$	29,058			$	—			$	29,058			$	—
Agency securities			41,744				—				41,744				—
Mortgage-backed securities			158,839				—				158,839				—
Corporate securities			892,848				—				892,848				—
Municipal securities			185,586				—				185,586				—
Other			168,855				—				168,855				—
Total		$	1,476,930			$	—			$	1,476,930			$	—

		Fair Value Measurements as
		of December 30, 2017
		Total				Level 1				Level 2				Level 3
U.S. Treasury securities		$	19,337			$	—			$	19,337			$	—
Agency securities			43,361				—				43,361				—
Mortgage-backed securities			174,615				—				174,615				—
Corporate securities			816,793				—				816,793				—
Municipal securities			186,105				—				186,105				—
Other			181,509				—				181,509				—
Total		$	1,421,720			$	—			$	1,421,720			$	—

Schedule of marketable securities classified as available-for-sale securities

Marketable securities classified as available-for-sale securities are summarized below:

		Available-For-Sale Securities as of March 31, 2018
		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
U.S. Treasury securities		$	29,439			$	—			$	(381	)		$	29,058
Agency securities			42,901				—				(1,156	)			41,745
Mortgage-backed securities			166,458				6				(7,625	)			158,839
Corporate securities			919,920				45				(27,117	)			892,848
Municipal securities			188,728				14				(3,157	)			185,585
Other			171,641				1				(2,787	)			168,855
Total		$	1,519,087			$	66			$	(42,223	)		$	1,476,930

		Available-For-Sale Securities as of December 30, 2017
		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Fair Value
U.S. Treasury securities		$	19,591			$	—			$	(254	)		$	19,337
Agency securities			44,191				1				(831	)			43,361
Mortgage-backed securities			180,470				13				(5,868	)			174,615
Corporate securities			830,447				136				(13,790	)			816,793
Municipal securities			187,999				110				(2,004	)			186,105
Other			183,730				2				(2,223	)			181,509
Total		$	1,446,428			$	262			$	(24,970	)		$	1,421,720

Schedule of gross unrealized losses and fair value by major security type

The following tables display additional information regarding gross unrealized losses and fair value by major security type for available-for-sale securities in an unrealized loss position as of March 31, 2018 and December 30, 2017.

		As of March 31, 2018
		Less than 12 Consecutive Months								12 Consecutive Months or Longer
		Gross Unrealized Losses				Fair Value				Gross Unrealized Losses				Fair Value
U.S. Treasury securities		$	(202	)		$	19,748			$	(179	)		$	6,319
Agency securities			(243	)			16,022				(913	)			25,723
Mortgage-backed securities			(711	)			17,631				(6,914	)			140,289
Corporate securities			(11,562	)			538,556				(15,555	)			341,137
Municipal securities			(1,786	)			139,591				(1,371	)			40,649
Other			(2,784	)			136,448				(3	)			1,934
Total		$	(17,288	)		$	867,996			$	(24,935	)		$	556,051

		As of December 30, 2017
		Less than 12 Consecutive Months								12 Consecutive Months or Longer
		Gross Unrealized Losses				Fair Value				Gross Unrealized Losses				Fair Value
U.S. Treasury securities		$	(111	)		$	12,966			$	(143	)		$	6,371
Agency securities			(168	)			16,097				(663	)			25,972
Mortgage-backed securities			(503	)			19,628				(5,365	)			153,835
Corporate securities			(4,562	)			439,174				(9,228	)			347,052
Municipal securities			(1,027	)			125,819				(977	)			38,167
Other			(2,219	)			136,147				(4	)			2,579
Total		$	(8,590	)		$	749,831			$	(16,380	)		$	573,976

Schedule of amortized cost and estimated fair value of marketable securities by contractual maturity

The amortized cost and fair value of marketable securities at March 31, 2018, by maturity, are shown below.

		Amortized Cost				Fair Value
Due in one year or less		$	168,370			$	167,745
Due after one year through five years			1,175,500				1,143,859
Due after five years through ten years			160,650				151,195
Due after ten years			14,567				14,131
		$	1,519,087			$	1,476,930

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- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value).

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