CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 48,872	$ 68,169
Restricted cash	5,932	6,935
Trade accounts and other receivables, net	37,669	37,705
Inventories:
Finished goods	48,199	59,519
Raw materials and supplies	25,684	19,480
Total inventories	73,883	78,999
Assets held for sale	17,842
Prepaid expenses and other current assets	5,366	3,989
Total current assets	189,564	195,797
Restricted cash	3,780	3,281
Income tax receivable	2,296	2,389
Property, plant and equipment:
Land and land improvements	39,584	41,590
Land-use and mineral rights	19,696	19,696
Buildings	75,814	72,427
Machinery and equipment	432,841	455,863
Construction in progress	29,571	36,138
Total property, plant and equipment	597,506	625,714
Less accumulated depreciation and amortization	316,183	301,528
Net property, plant and equipment	281,323	324,186
Goodwill	3,500	3,500
Intangible and other assets, net	6,280	11,445
Total assets	486,743	540,598
Current liabilities:
Accounts payable	15,372	19,417
Accrued payroll and benefits	6,380	6,056
Accrued freight	1,381	2,292
Accrued utilities	903	1,552
Derivative instruments	563	2,537
Notes payable, related parties	27,040
Other current liabilities	10,145	10,577
Total current liabilities	61,784	42,431
Deferred income taxes	63	230
Long-term debt, net	61,211	60,698
Notes payable, related parties		27,040
Other long-term liabilities	6,492	4,434
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; 27,730,631 and 27,133,614 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively	277	271
Additional paid-in capital	131,378	125,715
Retained earnings	225,538	279,779
Total shareholders' equity	357,193	405,765
Total liabilities and shareholders' equity	$ 486,743	$ 540,598