Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 52,021	$ 41,270
Trade accounts and other receivables, net	117,570	112,014
Inventories:
Finished goods	103,718	105,233
Raw materials and supplies	26,992	26,783
Total inventories	130,710	132,016
Prepaid expenses and other current assets	6,801	4,023
Prepaid income taxes		3,279
Deferred income taxes	11,026	9,963
Total current assets	318,128	302,565
Property, plant and equipment:
Land and land improvements	14,747	14,512
Land-use and mineral rights	10,355	8,610
Buildings	71,563	67,120
Machinery and equipment	513,228	455,563
Construction in progress	45,246	48,778
Total	655,139	594,583
Less accumulated depreciation and amortization	230,513	201,924
Net property, plant and equipment	424,626	392,659
Goodwill	12,164	12,164
Intangible and other assets, net	31,813	33,477
Total assets	786,731	740,865
Current liabilities:
Accounts payable	12,440	38,192
Accrued income taxes	4,727
Dividends payable	6,231
Other accrued expenses	31,191	40,874
Total current liabilities	54,589	79,066
Deferred income taxes	40,755	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, 80,000,000 and 40,000,000 shares authorized at September 30, 2012 and December 31, 2011, respectively; 23,078,445 and 23,106,358 shares issued and outstanding at September 30, 2012 and December 31, 2011, respectively	231	231
Additional paid-in capital	56,071	56,539
Retained earnings	637,871	577,253
Accumulated other comprehensive loss	(2,786)	(3,865)
Total shareholders' equity	691,387	630,158
Total liabilities and shareholders' equity	$ 786,731	$ 740,865