CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 24,298	$ 94,250
Trade accounts and other receivables, net	132,573	125,179
Inventories:
Finished goods	106,941	87,218
Raw materials and supplies	37,502	47,042
Total inventories	144,443	134,260
Prepaid expenses and other current assets	5,241	5,442
Prepaid income taxes	19,708	1,888
Deferred income taxes	11,348	10,363
Total current assets	337,611	371,382
Property, plant and equipment:
Land and land improvements	40,921	31,163
Land-use and mineral rights	19,877	12,751
Buildings	74,911	72,702
Machinery and equipment	627,517	535,529
Construction in progress	109,378	109,735
Total	872,604	761,880
Less accumulated depreciation and amortization	303,888	283,345
Net property, plant and equipment	568,716	478,535
Goodwill	12,164	12,164
Intangible and other assets, net	15,735	16,870
Total assets	934,226	878,951
Current liabilities:
Bank borrowings	25,000	0
Accounts payable	22,922	24,570
Accrued payroll and benefits	12,466	13,650
Accrued freight	5,925	6,873
Accrued utilities	3,714	3,577
Other accrued expenses	7,388	8,018
Total current liabilities	77,415	56,688
Deferred income taxes	80,754	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; 23,092,674 and 23,080,632 shares issued and outstanding at December 31, 2014 and 2013, respectively	231	231
Additional paid-in capital	59,297	56,782
Retained earnings	739,498	714,835
Accumulated other comprehensive loss	(22,969)	(3,261)
Total shareholders' equity	776,057	768,587
Total liabilities and shareholders' equity	$ 934,226	$ 878,951