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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents $ 33,619 $ 60,017
Accounts receivable, net 59,570 51,299
Inventories 21,856 22,939
Supplies, prepaid items and other:    
Prepaid insurance 10,535 11,217
Precious metals 7,411 8,648
Supplies 27,729 24,100
Prepaid and refundable income taxes 1,736 1,193
Other 1,284 1,733
Total supplies, prepaid items and other 48,695 46,891
Total current assets 163,740 181,146
Property, plant and equipment, net 1,014,038 1,078,958
Intangible and other assets, net 11,404 10,316
Total assets 1,189,182 1,270,420
Current liabilities:    
Accounts payable 55,992 54,246
Short-term financing 8,585 8,218
Accrued and other liabilities 35,573 44,037
Current portion of long-term debt 9,146 13,745
Total current liabilities 109,296 120,246
Long-term debt, net 400,253 406,475
Noncurrent accrued and other liabilities 11,691 12,326
Deferred income taxes 54,787 93,831
Commitments and contingencies (Note 11)
Stockholders' equity:    
Common stock, $.10 par value; 75,000,000 shares authorized, 31,280,685 shares issued 3,128 3,128
Capital in excess of par value 193,956 192,172
Retained earnings 256,214 314,301
Stockholders equity including treasury stock 456,298 512,601
Less treasury stock, at cost:    
Common stock, 2,662,027 shares (3,004,855 shares at December 31, 2016) 18,102 20,088
Total stockholders' equity 438,196 492,513
Total Liabilities and Stockholders' equity 1,189,182 1,270,420
Series E Preferred Stock [Member]    
Redeemable preferred stocks:    
Redeemable preferred stock, value 174,959 145,029
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