CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 16,686	$ 7,050
Accounts and other receivables – net	97,101	104,613
Inventories – net	173,873	171,710
Taxes receivable	13,807	2,047
Other current assets	7,096	5,117
Total current assets	308,563	290,537
Property, plant and equipment – net	765,125	755,881
Operating lease right-of-use assets	110,360	135,985
Goodwill	15,005	15,005
Other assets	36,079	38,561
Total assets	1,235,132	1,235,969
Current liabilities:
Accounts payable	179,652	205,911
Accrued liabilities	35,610	28,114
Operating lease liabilities – short-term	31,724	38,005
Deferred income and customer advances	6,176	19,696
Total current liabilities	253,162	291,726
Deferred income taxes	121,445	110,071
Operating lease liabilities – long-term	79,085	98,347
Line of credit – long-term	313,000	297,000
Postretirement benefit obligations	36,783	32,410
Other liabilities	10,623	5,537
Total liabilities	814,098	835,091
COMMITMENTS AND CONTINGENCIES (Note 10)
STOCKHOLDERS' EQUITY
Common stock, par value $0.01; 200,000,000 shares authorized; 31,622,910 shares issued and 28,030,271 outstanding at September 30, 2020; 31,423,898 shares issued and 27,914,777 outstanding at December 31, 2019	316	314
Preferred stock, par value $0.01; 50,000,000 shares authorized and 0 shares issued and outstanding at September 30, 2020 and December 31, 2019	0	0
Treasury stock at par (3,592,639 shares at September 30, 2020; 3,509,121 shares at December 31, 2019)	(36)	(35)
Additional paid-in capital	183,356	180,884
Retained earnings	248,479	229,166
Accumulated other comprehensive loss	(11,081)	(9,451)
Total stockholders' equity	421,034	400,878
Total liabilities and stockholders' equity	$ 1,235,132	$ 1,235,969