CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 199,833	$ 190,718
Accounts receivable, net	171,483	171,535
Inventories	121,032	119,183
Income taxes receivable and deferred	20,473	20,594
Prepaid expenses and other current assets	13,986	10,435
Total current assets	526,807	512,465
Property, plant and equipment, net	411,398	420,154
Intangibles	790	848
Goodwill	74,876	76,522
Deferred taxes	113,237	123,886
Other assets	24,211	22,822
Total assets	1,151,319	1,156,697
LIABILITIES AND SHAREHOLDERS' EQUITY
Notes and loans payable	780	586
Accounts payable	35,309	35,117
Accrued liabilities	101,435	103,257
Current maturities of long-term debt	55,014	83,276
Income taxes payable and deferred	7,648	13,552
Total current liabilities	200,186	235,788
Long-term debt	278,622	235,877
Other noncurrent liabilities	130,586	136,012
Deferred taxes and other credits	49,547	55,509
Total liabilities	658,941	663,186
SHAREHOLDERS' EQUITY
Preferred stock, par value $5.00 per share; authorized 2,000,000 shares; none issued
Common Stock	40	40
Additional paid-in capital	396,998	395,381
Retained earnings	442,865	435,775
Accumulated items of other comprehensive income:
Translation adjustments	(18,947)	(7,659)
Pension and postretirement liability adjustments	(68,315)	(69,484)
Derivative valuation adjustment	(2,599)	(2,878)
Treasury stock (Class A), at cost 8,467,873 shares in 2013 and 2012	(257,664)	(257,664)
Total shareholders' equity	492,378	493,511
Total liabilities and shareholders' equity	1,151,319	1,156,697
Common Class A [Member]
SHAREHOLDERS' EQUITY
Common Stock	37	37
Common Class B [Member]
SHAREHOLDERS' EQUITY
Common Stock	$ 3	$ 3