CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 67,663	$ 91,680
Restricted cash	5,696
Trade accounts and other receivables, net	35,804	23,622
Inventories:
Finished goods	65,241	74,133
Raw materials and supplies	18,455	23,041
Total inventories	83,696	97,174
Prepaid expenses and other current assets	4,959	3,548
Income tax receivable		1,199
Total current assets	197,818	217,223
Restricted cash	4,520
Income tax receivable	1,649
Property, plant and equipment:
Land and land improvements	41,590	45,530
Land-use and mineral rights	19,696	19,696
Buildings	72,427	87,318
Machinery and equipment	456,193	647,753
Construction in progress	36,255	92,704
Total property, plant and equipment	626,161	893,001
Less accumulated depreciation and amortization	293,144	398,898
Net property, plant and equipment	333,017	494,103
Goodwill	3,500	3,500
Intangible and other assets, net	7,984	8,631
Total assets	548,488	723,457
Current liabilities:
Long-term debt, current portion		13,000
Notes payable	874	551
Accounts payable	16,545	7,782
Accrued payroll and benefits	3,596	3,434
Derivative instruments	2,369	1,599
Other accrued expenses	11,072	8,438
Total current liabilities	34,456	34,804
Deferred income taxes	990	1,236
Long-term debt, net	60,526	42,404
Notes payable, related parties	25,997	25,000
Other long-term liabilities	4,243	3,443
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; 27,139,903 and 26,881,066 shares issued and outstanding at September 30, 2017 and December 31, 2016, respectively	271	269
Additional paid-in capital	124,836	117,192
Retained earnings	297,169	533,435
Accumulated other comprehensive loss		(34,326)
Total shareholders' equity	422,276	616,570
Total liabilities and shareholders' equity	$ 548,488	$ 723,457