Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 45,227	$ 52,617
Accounts and other receivables, net of allowance for doubtful accounts and sales returns of $2,679 in 2014 and $3,327 in 2013	118,584	99,246
Inventories	70,530	70,663
Deferred income taxes	5,642	5,628
Prepaid expenses and other	5,188	6,353
Total current assets	245,171	234,507
Property, plant and equipment, at cost	811,603	798,839
Less accumulated depreciation	524,182	516,279
Net property, plant and equipment	287,421	282,560
Goodwill and other intangibles, net	226,672	226,300
Other assets and deferred charges	49,266	49,641
Total assets	808,530	793,008
Current liabilities:
Accounts payable	91,461	82,795
Accrued expenses	37,552	42,158
Income taxes payable	3,609	114
Total current liabilities	132,622	125,067
Long-term debt	134,000	139,000
Deferred income taxes	70,581	70,795
Other noncurrent liabilities	55,157	55,482
Total liabilities	392,360	390,344
Commitments and contingencies (Notes 1, 3 and 14)
Shareholders’ equity:
Common stock, no par value (issued and outstanding - 32,377,204 at March 31, 2014 and 32,305,145 at December 31, 2013)	21,225	20,641
Common stock held in trust for savings restoration plan	(1,423)	(1,418)
Foreign currency translation adjustment	(14,110)	(19,205)
Gain (loss) on derivative financial instruments	957	765
Pension and other postretirement benefit adjustments	(70,108)	(71,848)
Retained earnings	479,629	473,729
Total shareholders’ equity	416,170	402,664
Total liabilities and shareholders’ equity	$ 808,530	$ 793,008