Joint Venture Transactions (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 24, 2020	Sep. 30, 2021	Sep. 24, 2020
Gain (Loss) on Disposition of Property Plant Equipment	$ 868,000	$ (251,000)	$ 2,908,000	$ (299,000)
Joint Venture [Member]
Recapitalization of investment value	$ 0		0
Sale of interest in equity investment			4,150,000
Gain (Loss) on Disposition of Property Plant Equipment			$ 2,079,000