Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 28, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 15,726	$ 16,056
Accounts receivable	129,831	126,482
Other receivables	445	405
Inventories	207,633	206,125
Prepaid expenses	30,591	41,685
Deferred income taxes	8,460	10,236
Total current assets	392,686	400,989
Related-party notes receivable	11	51
Long-term deferred income taxes	20,483	19,946
Property, plant and equipment—cost	794,389	779,785
Less allowances for depreciation, depletion and amortization	(523,659)	(507,243)
Property, plant and equipment—net	270,730	272,542
Intangible assets	26,594	28,869
Other assets	4,240	3,767
Goodwill	88,753	88,753
Total assets	803,497	814,917
Current liabilities
Short-term debt	36,562	49,432
Accounts payable	28,828	42,281
Other liabilities and accrued items	46,579	55,811
Unearned revenue	466	1,543
Total current liabilities	112,435	149,067
Other long-term liabilities	16,299	16,173
Retirement and post-employment benefits	123,448	125,978
Unearned income	58,837	61,184
Long-term income taxes	1,510	1,510
Deferred income taxes	614	1,130
Long-term debt	59,578	44,880
Shareholders’ equity	430,776	414,995
Total liabilities and shareholders’ equity	$ 803,497	$ 814,917