Consolidated Condensed Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
NET INCOME (LOSS)		$ 3,349	$ (7,060)	$ 1,321	$ (9,749)
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:
Unrealized gain (loss) on interest rate swaps		5	(139)	43	(1,276)
Income taxes		0	0	0	0
Unrealized gain (loss) on interest rate swaps, net		5	(139)	43	(1,276)
Reclassification of loss into earnings from interest rate swaps (1)	[1]	222	365	443	573
Income taxes		64	0	128	0
Reclassification of loss into earnings from interest rate swaps, net		158	365	315	573
Reclassification of net actuarial gain into earnings from postretirement benefit plans (2)	[2]	(6)	(6)	(12)	(13)
Income taxes		0	0	0	0
Reclassification of net actuarial gain into earnings from postretirement benefit plans, net		(6)	(6)	(12)	(13)
Reclassification of prior service credits into earnings from postretirement benefit plans (2)	[2]	0	(1)	0	(2)
Income taxes		0	0	0	0
Reclassification of prior service credits into earnings from postretirement benefit plans, net		0	(1)	0	(2)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX		157	219	346	(718)
COMPREHENSIVE INCOME (LOSS)		$ 3,506	$ (6,841)	$ 1,667	$ (10,467)

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