CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 32,033	$ 41,270
Trade accounts and other receivables, net	112,023	112,014
Inventories:
Finished goods	109,269	105,233
Raw materials and supplies	27,927	26,783
Total inventories	137,196	132,016
Prepaid expenses and other current assets	3,931	4,023
Prepaid income taxes		3,279
Deferred income taxes	9,979	9,963
Total current assets	295,162	302,565
Property, plant and equipment:
Land and land improvements	14,518	14,512
Land-use and mineral rights	8,618	8,610
Buildings	70,411	67,120
Machinery and equipment	482,133	455,563
Construction in progress	49,005	48,778
Total	624,685	594,583
Less accumulated depreciation and amortization	213,516	201,924
Net property, plant and equipment	411,169	392,659
Goodwill	12,164	12,164
Intangible and other assets, net	32,889	33,477
Total assets	751,384	740,865
Current liabilities:
Accounts payable	27,986	38,192
Accrued income taxes	8,167
Dividends payable	5,541
Other accrued expenses	26,151	40,874
Total current liabilities	67,845	79,066
Deferred income taxes	35,848	31,641
Shareholders' equity:
Preferred stock, par value $0.01 per share, 5,000 shares authorized, none outstanding
Common stock, par value $0.01 per share, 40,000,000 shares authorized; 23,085,313 and 23,106,358 shares issued and outstanding at March 31, 2012 and December 31, 2011, respectively	231	231
Additional paid-in capital	53,665	56,539
Retained earnings	594,520	577,253
Accumulated other comprehensive loss	(725)	(3,865)
Total shareholders' equity	647,691	630,158
Total liabilities and shareholders' equity	$ 751,384	$ 740,865