CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 72,663	$ 7,050
Accounts and other receivables – net	74,726	104,613
Inventories – net	183,724	171,710
Taxes receivable	10,173	2,047
Other current assets	8,633	5,117
Total current assets	349,919	290,537
Property, plant and equipment – net	764,029	755,881
Operating lease right-of-use assets	119,795	135,985
Goodwill	15,005	15,005
Other assets	37,251	38,561
Total assets	1,285,999	1,235,969
Current liabilities:
Accounts payable	151,786	205,911
Accrued liabilities	34,170	28,114
Operating lease liabilities – short-term	35,105	38,005
Deferred income and customer advances	5,263	19,696
Total current liabilities	226,324	291,726
Deferred income taxes	119,941	110,071
Operating lease liabilities – long-term	85,176	98,347
Line of credit – long-term	388,000	297,000
Postretirement benefit obligations	34,759	32,410
Other liabilities	11,012	5,537
Total liabilities	865,212	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 June 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 June 30, 2020 and December 31, 2019	0	0
Treasury stock at par (3,592,639 shares at June 30, 2020; 3,509,121 shares at December 31, 2019)	(36)	(35)
Additional paid-in capital	182,753	180,884
Retained earnings	249,171	229,166
Accumulated other comprehensive loss	(11,417)	(9,451)
Total stockholders' equity	420,787	400,878
Total liabilities and stockholders' equity	$ 1,285,999	$ 1,235,969