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Investments: (Tables)

9 Months Ended

Sep. 26, 2015

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

	September 26, 2015				December 27, 2014
	Cost		Fair Value		Cost		Fair Value
Equity securities	$	280,600	$	226,500	$	526,600	$	466,800

Schedule of the Company's unrealized gains and losses for marketable securities classified as available-for-sale securities in accumulated other comprehensive loss

	September 26, 2015			December 27, 2014
Unrealized gains	$	—		$	3,300
Unrealized losses	(54,100		)	(63,100		)

Net unrealized losses	$	(54,100	)	$	(59,800	)

Schedule of the Company's realized gains and losses recognized on sales of available-for-sale marketable securities

	Three Months Ended				Nine Months Ended
	September 26, 2015		September 27, 2014		September 26, 2015			September 27, 2014
Realized gains	$	—	$	12,200	$	13,400		$	39,000
Realized losses	—		—		(36,200		)	(26,300		)

Net realized gains/(losses)	$	—	$	12,200	$	(22,800	)	$	12,700

- 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.

+ References + Details