Consolidated Balance Sheets (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 53,250	$ 46,656
Trade accounts and other receivables, net	104,326	89,531
Inventories:
Finished goods, net	59,193	47,872
Raw materials and supplies	46,250	43,183
Total inventories	105,443	91,055
Prepaid expenses and other current assets	5,265	2,970
Prepaid income taxes	2,746
Deferred income taxes	7,925	7,443
Total current assets	278,955	237,655
Property, plant and equipment:
Land and land improvements	14,080	14,074
Land-use and mineral rights	8,592	8,041
Buildings	58,258	56,442
Machinery and equipment	374,524	362,286
Construction in progress	92,439	67,551
Total	547,893	508,394
Less accumulated depreciation and amortization	185,614	169,911
Net property, plant and equipment	362,279	338,483
Goodwill	12,164	13,053
Intangible and other assets, net	9,180	10,380
Total assets	662,578	599,571
Current liabilities:
Accounts payable	19,635	22,161
Accrued income taxes		113
Other accrued expenses	32,292	28,973
Total current liabilities	51,927	51,247
Deferred income taxes	30,543	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; 23,162,332 and 23,108,082 shares issued and outstanding at June 30, 2011 and December 31, 2010, respectively	232	231
Additional paid-in capital	61,133	57,475
Retained earnings	518,416	468,387
Accumulated other comprehensive income (loss)	327	(4,114)
Total shareholders' equity	580,108	521,979
Total liabilities and shareholders' equity	$ 662,578	$ 599,571