Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 30, 2014	Dec. 28, 2013
Current assets
Cash and cash equivalents	$ 2,825	$ 1,800
Accounts receivable, less allowance for doubtful accounts of $975 and $907, respectively	81,823	75,928
Inventories	97,546	92,313
Other current assets	63,364	65,331
Total current assets	245,558	235,372
Property, plant and equipment, net of accumulated depreciation of $631,991 and $625,593, respectively	242,764	245,233
Intangible assets, net	40,983	41,554
Other assets	25,465	25,369
Total assets	554,770	547,528
Current liabilities
Current portion of long-term debt	11,709	4,734
Accounts payable	67,832	61,454
Accrued interest	11,217	6,360
Other accrued liabilities	94,948	97,615
Total current liabilities	185,706	170,163
Long-term debt	587,991	592,412
Postretirement benefits other than pension	30,555	30,605
Accrued pension	59,920	66,143
Other long-term liabilities	37,347	36,243
Commitments and contingencies (Note 11)
Redeemable common stock, $0.01 par value, shares authorized: 30,000,000, shares issued and outstanding: 8,128,417 and 8,129,112, respectively	157,429	157,445
Accumulated deficit	(507,280)	(509,296)
Accumulated other comprehensive income	3,102	3,813
Total liabilities, redeemable common stock, accumulated deficit and accumulated other comprehensive income	$ 554,770	$ 547,528