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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 143,750 $ 98,020
Restricted cash   31
Accounts receivable, net 80,570 82,801
Inventories 55,872 64,973
Supplies, prepaid items and other:    
Prepaid insurance 15,073 10,049
Precious metals 14,927 13,528
Supplies 13,523 9,855
Prepaid income taxes 12,644  
Other 3,867 2,266
Total supplies, prepaid items and other 60,034 35,698
Deferred income taxes 13,613 3,224
Total current assets 353,839 284,747
Property, plant and equipment, net 416,801 281,871
Other assets:    
Noncurrent restricted cash 80,974  
Noncurrent restricted investments 209,990  
Debt issuance costs, net 8,027 876
Other, net 13,466 9,118
Total other assets 312,457 9,994
Total assets 1,083,097 576,612
Current liabilities:    
Accounts payable 61,775 68,333
Short-term financing 13,749 9,254
Accrued and other liabilities 49,107 34,698
Current portion of long-term debt 9,262 4,798
Total current liabilities 133,893 117,083
Long-term debt 453,705 67,643
Noncurrent accrued and other liabilities 17,086 16,369
Deferred income taxes 66,698 21,020
Commitments and contingencies (Note 11)      
Stockholders' equity:    
Common stock, $.10 par value; 75,000,000 shares authorized, 26,846,470 shares issued (26,731,360 shares at December 31, 2012) 2,685 2,673
Capital in excess of par value 167,550 165,006
Retained earnings 266,854 212,192
Stockholders equity including treasury stock 440,089 382,871
Less treasury stock, at cost:    
Common stock, 4,320,462 shares 28,374 28,374
Total stockholders' equity 411,715 354,497
Total Liabilities and Stockholders' equity 1,083,097 576,612
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