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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents $ 67,213 $ 60,017
Accounts receivable, net 51,013 51,299
Inventories:    
Finished goods 15,910 19,036
Raw materials 1,377 3,903
Total inventories 17,287 22,939
Supplies, prepaid items and other:    
Prepaid insurance 5,057 11,217
Precious metals 8,806 8,648
Supplies 26,261 24,100
Prepaid and refundable income taxes 2,233 1,193
Other 1,886 1,733
Total supplies, prepaid items and other 44,243 46,891
Total current assets 179,756 181,146
Property, plant and equipment, net 1,036,758 1,078,958
Intangible and other assets, net 9,083 10,316
Total assets 1,225,597 1,270,420
Current liabilities:    
Accounts payable 49,200 54,246
Short-term financing 2,622 8,218
Accrued and other liabilities 32,156 44,037
Current portion of long-term debt 9,622 13,745
Total current liabilities 93,600 120,246
Long-term debt, net 401,889 406,475
Noncurrent accrued and other liabilities 13,075 12,326
Deferred income taxes 88,768 93,831
Commitments and contingencies (Note 8)
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 194,009 192,172
Retained earnings 287,800 314,301
Stockholders equity including treasury stock 487,937 512,601
Less treasury stock, at cost:    
Common stock, 2,875,582 shares (3,004,855 shares at December 31, 2016) 19,243 20,088
Total stockholders' equity 468,694 492,513
Total Liabilities and Stockholders' equity 1,225,597 1,270,420
Series E Preferred Stock [Member]    
Redeemable preferred stocks:    
Redeemable preferred stock, value 159,571 145,029
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