Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands		12 Months Ended
		Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
NET INCOME (LOSS)		$ 15,271	$ (21,384)	$ (9,555)
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX:
Unrealized gain (loss) on interest rate swaps		(1,109)	531	180
Income taxes		0	0	68
Unrealized gain (loss) on interest rate swaps, net		(1,109)	531	112
Reclassification of loss into earnings from interest rate swaps (1)	[1]	454	673	1,250
Income taxes		10	0	475
Reclassification of loss into earnings from interest rate swaps, net		444	673	775
Unrecognized net actuarial gain (loss) on postretirement benefit plans		(6)	18	11
Income taxes		0	0	4
Unrecognized net actuarial gain (loss) on postretirement benefit plans, net		(6)	18	7
Reclassification of net actuarial gain into earnings from postretirement benefit plans (2)	[2]	(27)	(27)	(30)
Income taxes		0	0	(11)
Reclassification of net actuarial gain into earnings from postretirement benefit plans, net		(27)	(27)	(19)
Reclassification of prior service credits into earnings from postretirement benefit plans (2)	[2]	(2)	(4)	(4)
Income taxes		0	0	(1)
Reclassification of prior service credits into earnings from postretirement benefit plans, net		(2)	(4)	(3)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX		(700)	1,191	872
COMPREHENSIVE INCOME (LOSS)		$ 14,571	$ (20,193)	$ (8,683)

[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.