Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 22,791	$ 26,048
Accounts receivable	40,203	67,043
Allowance for doubtful accounts	(261)	(351)
Accounts receivable, net	39,942	66,692
Inventories:
Finished goods	21,738	27,726
Raw materials	1,573	1,483
Total inventories	23,311	29,209
Supplies, prepaid items and other:
Prepaid insurance	11,837	10,924
Supplies	24,689	24,576
Other	8,303	8,964
Total supplies, prepaid items and other	44,829	44,464
Total current assets	130,873	166,413
Property, plant and equipment, net	936,474	974,248
Other assets:
Operating lease assets	15,330
Intangible and other assets, net	5,812	7,672
Total other assets	21,142	7,672
Total assets	1,088,489	1,148,333
Current liabilities:
Accounts payable	58,477	62,589
Short-term financing	9,929	8,577
Accrued and other liabilities	25,484	42,129
Current portion of long-term debt	9,410	12,518
Total current liabilities	103,300	125,813
Long-term debt, net	449,634	412,681
Noncurrent operating lease liabilities	11,404
Other noncurrent accrued and other liabilities	6,214	8,861
Deferred income taxes	35,717	56,612
Commitments and contingencies (Note 9)
Stockholders' equity:
Common stock, $.10 par value; 75,000,000 shares authorized, 31,283,210 shares issued (31,283,210 shares at December 31, 2018)	3,128	3,128
Capital in excess of par value	196,833	198,482
Retained earnings	57,632	153,773
Stockholders equity including treasury stock	260,593	358,383
Less treasury stock, at cost:
Common stock, 2,009,566 shares (2,438,305 shares at December 31, 2018)	13,266	16,186
Total stockholders' equity	247,327	342,197
Total Liabilities and Stockholders' equity	1,088,489	1,148,333
Series E Preferred Stock [Member]
Redeemable preferred stocks:
Redeemable preferred stock, value	234,893	202,169
Series B Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value	2,000	2,000
Series D Preferred Stock [Member]
Stockholders' equity:
Preferred stock, value	$ 1,000	$ 1,000