Consolidated Condensed Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
NET INCOME (LOSS)		$ 860	$ (2,554)	$ (8,890)	$ (10,442)
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:
Unrealized loss on interest rate swaps		(25)	(159)	(1,300)	(1,264)
Income taxes		0	0	0	0
Unrealized loss on interest rate swaps, net		(25)	(159)	(1,300)	(1,264)
Reclassification of loss into earnings from interest rate swaps (1)	[1]	420	125	993	273
Income taxes		0	0	0	10
Reclassification of loss into earnings from interest rate swaps, net		420	125	993	263
Reclassification of unrealized loss into earnings from dedesignated interest rate swaps (2)	[2]	95	0	95	0
Income taxes		0	0	0	0
Reclassification of unrealized loss into earnings from dedesignated interest rate swaps, net		95	0	95	0
Reclassification of net actuarial gain into earnings from postretirement benefit plans (3)	[3]	(6)	(7)	(20)	(19)
Income taxes		0	0	0	0
Reclassification of net actuarial gain into earnings from postretirement benefit plans, net		(6)	(7)	(20)	(19)
Reclassification of prior service credits into earnings from postretirement benefit plans (3)	[3]	(1)	(1)	(3)	(3)
Income taxes		0	0	0	0
Reclassification of prior service credits into earnings from postretirement benefit plans, net		(1)	(1)	(3)	(3)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX		483	(42)	(235)	(1,023)
COMPREHENSIVE INCOME (LOSS)		$ 1,343	$ (2,596)	$ (9,125)	$ (11,465)

[1] Amounts for cash flow hedges reclassified from accumulated other comprehensive income (loss) to net income (loss) were included in interest expense in the Company's Consolidated Condensed Statements of Operations.

[2] Amounts for dedesignated cash flow hedges reclassified from accumulated other comprehensive income (loss) to net income (loss) were included in other expense (income), net in the Company's Consolidated Condensed Statements of Operations.

[3] Amounts for postretirement plans reclassified from accumulated other comprehensive income (loss) to net loss were included in selling and administrative expenses in the Company's Consolidated Condensed Statements of Operations.