CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 30,104	$ 94,250
Trade accounts and other receivables, net	112,825	125,179
Inventories:
Finished goods	107,009	87,218
Raw materials and supplies	35,706	47,042
Total inventories	142,715	134,260
Prepaid expenses and other current assets	7,066	5,442
Prepaid income taxes	5,299	1,888
Deferred income taxes	12,756	10,363
Total current assets	310,765	371,382
Property, plant and equipment:
Land and land improvements	36,711	31,163
Land-use and mineral rights	21,110	12,751
Buildings	77,082	72,702
Machinery and equipment	642,364	535,529
Construction in progress	103,028	109,735
Total	880,295	761,880
Less accumulated depreciation and amortization	313,197	283,345
Net property, plant and equipment	567,098	478,535
Goodwill	12,164	12,164
Intangible and other assets, net	19,490	16,870
Total assets	909,517	878,951
Current liabilities:
Accounts payable	30,776	24,570
Accrued payroll and benefits	11,373	13,650
Dividends payable	7,621
Other accrued expenses	19,227	18,468
Total current liabilities	68,997	56,688
Deferred income taxes	56,132	53,676
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 shares authorized; 23,094,721 and 23,080,632 shares issued and outstanding at September 30, 2014 and December 31, 2013, respectively	231	231
Additional paid-in capital	57,684	56,782
Retained earnings	739,185	714,835
Accumulated other comprehensive loss	(12,712)	(3,261)
Total shareholders' equity	784,388	768,587
Total liabilities and shareholders' equity	$ 909,517	$ 878,951