CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 72,752	$ 68,169
Restricted cash	1,725	6,935
Trade accounts and other receivables, net	35,693	37,705
Inventories:
Finished goods	41,422	59,519
Raw materials and supplies	22,592	19,480
Total inventories	64,014	78,999
Prepaid expenses and other current assets	4,754	3,989
Income tax receivable	2,319
Total current assets	181,257	195,797
Restricted cash	8,840	3,281
Income tax receivable		2,389
Property, plant and equipment:
Land and land improvements	39,584	41,590
Land-use and mineral rights	19,696	19,696
Buildings	75,815	72,427
Machinery and equipment	432,906	455,863
Construction in progress	29,129	36,138
Total property, plant and equipment	597,130	625,714
Less accumulated depreciation and amortization	323,511	301,528
Net property, plant and equipment	273,619	324,186
Goodwill	3,500	3,500
Intangible and other assets, net	7,150	11,445
Total assets	474,366	540,598
Current liabilities:
Accounts payable	12,174	19,417
Accrued payroll and benefits	6,950	6,056
Accrued freight	2,434	2,292
Accrued utilities	1,012	1,552
Other accrued expenses	14,020	10,577
Derivative instruments		2,537
Notes payable, related parties	27,040
Long-term debt, current portion	15,733
Other current liabilities	1,192
Total current liabilities	80,555	42,431
Deferred income taxes	1,114	230
Long-term debt, net	45,650	60,698
Notes payable, related parties		27,040
Other long-term liabilities	10,764	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; 27,710,861 and 27,133,614 shares issued and outstanding at December 31, 2018 and 2017, respectively	277	271
Additional paid-in capital	132,080	125,715
Retained earnings	203,926	279,779
Total shareholders’ equity	336,283	405,765
Total liabilities and shareholders’ equity	$ 474,366	$ 540,598