Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012
Cash Flows from Operating Activities
Net income	$ 17,805	$ 16,995
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	28,889	30,841
Amortization of intangibles	166	208
Deferred income taxes	576	2,196
(Gain)/loss on sale of property, plant and equipment	(763)	392
Amortization of debt costs	971	1,154
Amortization of deferred gain related to terminated interest rate agreements	(273)	(615)
Stock compensation expense	1,223	1,286
Increase in current assets less current liabilities	(19,542)	(14,679)
Increase in other noncurrent assets	(4,890)	(5,280)
Increase (decrease) in other noncurrent liabilities	872	(16,336)
Other	15	0
Total adjustments	7,244	(833)
Net cash provided by operating activities	25,049	16,162
Cash Flows from Investing Activities
Additions to property, plant and equipment	(33,140)	(24,817)
Proceeds from the sale of property, plant and equipment	5,669	153
Change in restricted cash	0	3,000
Net cash used in investing activities	(27,471)	(21,664)
Cash Flows from Financing Activities
Borrowings under revolving credit facility	55,000	0
Payment on revolving credit facility	(30,000)	0
Cash dividends paid	(4,620)	(4,610)
Principal payments on capital lease obligations	(2,572)	(2,260)
Other	(60)	(58)
Net cash provided by (used in) financing activities	17,748	(6,928)
Net increase (decrease) in cash	15,326	(12,430)
Cash at beginning of period	10,399	90,758
Cash at end of period	25,725	78,328
Significant non-cash investing and financing activities:
Issuance of Class B Common Stock in connection with stock award	1,298	1,421
Capital lease obligations incurred	$ 455	$ 209