Investment Securities (Tables)

12 Months Ended

Dec. 27, 2014

Investment Securities [Abstract]

Available For Sale Investments

	December 27, 2014
			Gross		Gross
			Unrealized		Unrealized
(in thousands)	Amortized Cost		Gains*		Losses*		Fair Value
Cash equivalents:
Money market funds	$	8,729	$	—	$	—	$	8,729
Total cash equivalents		8,729		—		—		8,729
Short-term investments:
Corporate bonds and notes		43,777		498		(16)		44,259
US treasury and government agency notes		1,010		79		—		1,089
Foreign government and agency notes		501		36		—		537
Total short-term investments		45,288		613		(16)		45,885
Long-term investment securities:
Corporate bonds and notes		61,357		28		(213)		61,172
US treasury and government agency notes		38,650		7		(76)		38,581
Foreign government and agency notes		7,563		1		(39)		7,525
US states and municipal securities		230		1		—		231
Total long-term investment securities		107,800		37		(328)		107,509
Total	$	161,817	$	650	$	(344)	$	162,123

*        Gross unrealized gains include accrued interest on investments of $0.6 million, which are included in the Consolidated Statement of Operations.  The remainder of the gross unrealized gains and losses are included the Consolidated Balance Sheet as Accumulated other comprehensive income (loss).

	December 28, 2013
			Gross		Gross
			Unrealized		Unrealized
(in thousands)	Amortized Cost		Gains*		Losses*		Fair Value
Cash equivalents:
Money market funds	$	14,629	$	—	$	—	$	14,629
Total cash equivalents		14,629		—		—		14,629
Short-term investments:
Corporate bonds and notes		7,735		416		(2)		8,149
US treasury and government agency notes		2,499		44		—		2,543
US states and municipal securities		200		2		—		202
Total short-term investments		10,434		462		(2)		10,894
Long-term investment securities:
Corporate bonds and notes		74,583		121		(34)		74,670
US treasury and government agency notes		26,421		30		(9)		26,442
Foreign government and agency notes		2,049		1		(2)		2,048
US states and municipal securities		230		1		—		231
Total long-term investment securities		103,283		153		(45)		103,391
Total	$	128,346	$	615	$	(47)	$	128,914

*Gross unrealized gains include accrued interest on investments of $0.5 million, which are included in the Consolidated Statement of Operations.  The remainder of the gross unrealized gains and losses are included the Consolidated Balance Sheet as Accumulated other comprehensive income (loss).