Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands		12 Months Ended
		Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
NET INCOME (LOSS)		$ (9,208)	$ 15,271	$ (21,384)
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:
Unrealized gain (loss) on interest rate swaps		(1,316)	(1,109)	531
Income taxes		0	0	0
Unrealized gain (loss) on interest rate swaps, net		(1,316)	(1,109)	531
Reclassification of loss into earnings from interest rate swaps (1)	[1]	1,967	454	673
Income taxes		343	10	0
Reclassification of loss into earnings from interest rate swaps, net		1,624	444	673
Unrecognized net actuarial gain (loss) on postretirement benefit plans		0	(6)	18
Income taxes		0	0	0
Unrecognized net actuarial gain (loss) on postretirement benefit plans, net		0	(6)	18
Reclassification of net actuarial gain into earnings from postretirement benefit plans (2)	[2]	(27)	(27)	(27)
Income taxes		0	0	0
Reclassification of net actuarial gain into earnings from postretirement benefit plans, net		(27)	(27)	(27)
Reclassification of prior service credits into earnings from postretirement benefit plans (2)	[2]	(3)	(2)	(4)
Income taxes		0	0	0
Reclassification of prior service credits into earnings from postretirement benefit plans, net		(3)	(2)	(4)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX		278	(700)	1,191
COMPREHENSIVE INCOME (LOSS)		$ (8,930)	$ 14,571	$ (20,193)

[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 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 Statements of Operations.