CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 41,270	$ 46,656
Trade accounts and other receivables, net	112,014	89,531
Inventories:
Finished goods, net	105,233	47,872
Raw materials and supplies	26,783	43,183
Total inventories	132,016	91,055
Prepaid expenses and other current assets	4,023	2,970
Prepaid income taxes	3,279
Deferred income taxes	9,963	7,443
Total current assets	302,565	237,655
Property, plant and equipment:
Land and land improvements	14,512	14,074
Land-use and mineral rights	8,610	8,041
Buildings	67,120	56,442
Machinery and equipment	455,563	362,286
Construction in progress	48,778	67,551
Total	594,583	508,394
Less accumulated depreciation and amortization	201,924	169,911
Net property, plant and equipment	392,659	338,483
Goodwill	12,164	13,053
Intangible and other assets, net	33,477	10,380
Total assets	740,865	599,571
Current liabilities:
Accounts payable	38,192	22,161
Accrued payroll and benefits	17,237	12,755
Accrued freight	10,911	5,186
Accrued utilities	3,704	3,523
Accrued income taxes		113
Other accrued expenses	9,022	7,509
Total current liabilities	79,066	51,247
Deferred income taxes	31,641	26,345
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; 23,106,358 and 23,108,082 shares issued and outstanding at December 31, 2011 and 2010, respectively	231	231
Additional paid-in capital	56,539	57,475
Retained earnings	577,253	468,387
Accumulated other comprehensive loss	(3,865)	(4,114)
Total shareholders' equity	630,158	521,979
Total liabilities and shareholders' equity	$ 740,865	$ 599,571