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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 169,824 $ 143,750
Short-term investments 14,500  
Accounts receivable, net 88,249 80,570
Inventories:    
Finished goods 27,120 29,163
Work in progress 2,724 2,838
Raw materials 27,819 23,871
Total inventories 57,663 55,872
Supplies, prepaid items and other:    
Prepaid insurance 3,454 15,073
Precious metals 12,350 14,927
Supplies 15,117 13,523
Prepaid income taxes 5,835 12,644
Other 4,237 3,867
Total supplies, prepaid items and other 40,993 60,034
Deferred income taxes 8,198 13,613
Total current assets 379,427 353,839
Property, plant and equipment, net 561,270 416,801
Other assets:    
Noncurrent restricted cash and cash equivalents 76,804 80,974
Noncurrent restricted investments 50,000 209,990
Debt issuance costs, net 6,917 8,027
Other, net 19,226 13,466
Total other assets 152,947 312,457
Total assets 1,093,644 1,083,097
Current liabilities:    
Accounts payable 75,567 61,775
Short-term financing 1,513 13,749
Accrued and other liabilities 34,306 49,107
Current portion of long-term debt 10,597 9,262
Total current liabilities 121,983 133,893
Long-term debt 448,773 453,705
Noncurrent accrued and other liabilities 17,636 17,086
Deferred income taxes 72,825 66,698
Commitments and contingencies (Note 9)      
Stockholders' equity:    
Common stock, $.10 par value; 75,000,000 shares authorized, 26,920,053 shares issued (26,846,470 at December 31, 2013) 2,692 2,685
Capital in excess of par value 169,578 167,550
Retained earnings 285,531 266,854
Stockholders equity including treasury stock 460,801 440,089
Less treasury stock, at cost:    
Common stock, 4,320,462 shares 28,374 28,374
Total stockholders' equity 432,427 411,715
Total Liabilities and Stockholders' equity 1,093,644 1,083,097
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