CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 57,467	$ 63,623
Accounts receivable, less allowances (2013 - $459; 2012 - $469)	56,661	47,486
Inventories	37,575	31,292
Prepaid expenses and other current assets	9,438	9,400
Total current assets	161,141	151,801
Property, plant and equipment, at cost	248,917	249,206
Accumulated depreciation	(174,220)	(172,952)
Net, property, plant and equipment	74,697	76,254
Goodwill	18,191	18,282
Other intangible assets	3,564	3,825
Other assets, net	1,276	1,754
Total assets	258,869	251,916
Current liabilities:
Current portion of long-term debt	683	765
Accounts payable	33,241	29,441
Accrued payroll and other compensation	8,481	10,273
Accrued taxes	2,292	1,728
Other accrued liabilities	4,954	4,143
Total current liabilities	49,651	46,350
Long-term debt	1,449	1,646
Deferred tax liabilities	4,202	3,902
Benefit plan liabilities	24,937	25,080
Other long-term liabilities	666	442
Commitments and Contingencies (Note 11)
Stockholders' equity:
Preferred stock	0	0
Common stock	2,386	2,379
Capital in excess of par value	59,964	58,784
Retained earnings	205,589	201,097
Accumulated other comprehensive loss	(20,235)	(18,366)
Treasury stock, at cost	(69,740)	(69,398)
Total stockholders' equity	177,964	174,496
Total liabilities and stockholders' equity	$ 258,869	$ 251,916