CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 30,754	$ 7,050
Accounts and other receivables – net	113,302	104,613
Inventories – net	158,066	171,710
Taxes receivable	9,701	2,047
Other current assets	4,641	5,117
Total current assets	316,464	290,537
Property, plant and equipment – net	766,355	755,881
Operating lease right-of-use assets	127,501	135,985
Goodwill	15,005	15,005
Other assets	37,987	38,561
Total assets	1,263,312	1,235,969
Current liabilities:
Accounts payable	185,938	205,911
Accrued liabilities	31,311	28,114
Operating lease liabilities – short-term	38,361	38,005
Deferred income and customer advances	13,070	19,696
Total current liabilities	268,680	291,726
Deferred income taxes	120,663	110,071
Operating lease liabilities – long-term	89,759	98,347
Line of credit – long-term	337,000	297,000
Postretirement benefit obligations	32,734	32,410
Other liabilities	6,640	5,537
Total liabilities	855,476	835,091
COMMITMENTS AND CONTINGENCIES (Note 10)
STOCKHOLDERS' EQUITY
Common stock, par value $0.01; 200,000,000 shares authorized; 31,578,393 shares issued and 27,996,115 outstanding at March 31, 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 March 31, 2020 and December 31, 2019	0	0
Treasury stock at par (3,582,278 shares at March 31, 2020; 3,509,121 shares at December 31, 2019)	(36)	(35)
Additional paid-in capital	181,158	180,884
Retained earnings	237,742	229,166
Accumulated other comprehensive loss	(11,344)	(9,451)
Total stockholders' equity	407,836	400,878
Total liabilities and stockholders' equity	$ 1,263,312	$ 1,235,969