Condensed Consolidated Balance Sheets - Unaudited (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current Assets
Cash and cash equivalents	$ 109,432	$ 109,571
Accounts receivable, less allowances (2013 - $747; 2012 - $811)	93,730	89,342
Inventories - Note D	82,144	81,752
Other current assets	29,741	28,633
Total current assets	315,047	309,298
Property, plant and equipment, less accumulated depreciation (2013 - $235,382; 2012 - $240,693)	94,115	93,725
Other Assets
Goodwill - Note L	35,156	35,156
Other indefinite-lived intangible asset - Note L	820	820
Other intangible assets, net - Note L	45,785	47,538
Deferred income taxes	72,207	73,158
Other	1,420	1,484
Total other assets	155,388	158,156
Total Assets	564,550	561,179
Current Liabilities
Accounts payable	68,328	67,973
Accrued liabilities	40,066	47,056
Total current liabilities	108,394	115,029
Long-term debt - Note E	164,000	153,500
Other long-term obligations	22,434	24,892
Shareholders' Equity
Preferred stock - authorized 25,000,000 shares without par value; none issued
Common stock - authorized 75,000,000 shares without par value; 55,495,710 shares issued at March 31, 2013 and 55,263,082 shares issued at December 31, 2012	294,288	291,512
Additional contributed capital	37,979	40,008
Retained earnings	370,194	367,800
Accumulated other comprehensive loss	(120,733)	(120,604)
Total shareholder's equity before treasury	581,728	578,716
Cost of common stock held in treasury (2013 - 21,935,218 and 2012 - 21,829,954 shares)	(312,006)	(310,958)
Total shareholders' equity	269,722	267,758
Total Liabilities and Shareholders' Equity	$ 564,550	$ 561,179