CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 71,190	$ 72,752
Restricted cash	1,725	1,725
Trade accounts and other receivables, net	29,520	35,693
Inventories:
Finished goods	35,489	41,422
Raw materials and supplies	19,201	22,592
Total inventories	54,690	64,014
Prepaid expenses and other current assets	4,413	4,754
Income tax receivable	2,383	2,319
Total current assets	163,921	181,257
Restricted cash	8,853	8,840
Property, plant and equipment:
Land and land improvements	39,584	39,584
Land-use and mineral rights	19,696	19,696
Buildings	75,804	75,815
Machinery and equipment	433,307	432,906
Construction in progress	28,946	29,129
Total property, plant and equipment	597,337	597,130
Less accumulated depreciation and amortization	330,814	323,511
Net property, plant and equipment	266,523	273,619
Goodwill	3,500	3,500
Operating lease right-of-use assets	54,452
Intangible and other assets, net	7,669	7,150
Total assets	504,918	474,366
Current liabilities:
Accounts payable	12,578	12,174
Accrued payroll and benefits	3,840	6,950
Accrued freight	2,229	2,434
Accrued utilities	656	1,012
Other accrued expenses	7,512	14,020
Notes payable, related parties	27,040	27,040
Long-term debt, current portion	15,733	15,733
Operating lease liabilities	10,557
Other current liabilities	745	1,192
Total current liabilities	80,890	80,555
Deferred income taxes	1,114	1,114
Long-term debt, net	45,820	45,650
Noncurrent operating lease liabilities	52,805
Other long-term liabilities	4,193	10,764
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; 28,985,866 and 27,710,861 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively	290	277
Additional paid-in capital	136,152	132,080
Retained earnings	183,654	203,926
Total shareholders' equity	320,096	336,283
Total liabilities and shareholders' equity	$ 504,918	$ 474,366