CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 107,999	$ 78,866
Trade accounts and other receivables, net	19,457	48,596
Inventories:
Finished goods	81,188	77,537
Raw materials and supplies	22,709	27,021
Total inventories	103,897	104,558
Prepaid expenses and other current assets	3,760	3,762
Prepaid income taxes	275
Deferred income taxes		49,495
Total current assets	235,388	285,277
Property, plant and equipment:
Land and land improvements	45,529	45,774
Land-use and mineral rights	19,696	19,877
Buildings	87,193	83,500
Machinery and equipment	645,871	642,396
Construction in progress	93,908	96,084
Total property, plant and equipment	892,197	887,631
Less accumulated depreciation and amortization	386,741	349,900
Net property, plant and equipment	505,456	537,731
Goodwill	3,500	3,500
Intangible and other assets, net	8,630	9,861
Total assets	752,974	836,369
Current liabilities:
Long-term debt, current portion	12,783	33,000
Notes payable	1,010
Accounts payable	2,673	10,709
Accrued payroll and benefits	3,096	6,003
Accrued freight	390	3,068
Accrued utilities	1,112	2,414
Accrued income taxes		139
Derivative instruments	3,559	6,240
Other accrued expenses	7,337	8,717
Total current liabilities	31,960	70,290
Deferred income taxes	16,494	63,858
Long-term debt	45,592	55,000
Notes payable, related parties	25,000
Other long-term liabilities	3,815	4,915
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; 26,902,937 and 23,280,696 shares issued and outstanding at September 30, 2016 and December 31, 2015, respectively	269	233
Additional paid-in capital	116,076	65,067
Retained earnings	548,637	614,708
Accumulated other comprehensive loss	(34,869)	(37,702)
Total shareholders' equity	630,113	642,306
Total liabilities and shareholders' equity	$ 752,974	$ 836,369