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Consolidated Balance Sheets (USD $)
Dec. 31, 2011
Dec. 31, 2010
Current assets:    
Cash and cash equivalents $ 124,929,000 $ 66,946,000
Restricted cash 31,000 31,000
Short-term investments 10,005,000 10,003,000
Accounts receivable, net 87,351,000 74,259,000
Inventories 59,506,000 60,106,000
Supplies, prepaid items and other:    
Prepaid insurance 5,953,000 4,449,000
Precious metals 17,777,000 12,048,000
Supplies 7,513,000 6,802,000
Fair value of derivatives and other 53,000 1,454,000
Prepaid income taxes 8,679,000 0
Other 2,034,000 1,174,000
Total supplies, prepaid items and other 42,009,000 25,927,000
Deferred income taxes 4,275,000 5,396,000
Total current assets 328,106,000 242,668,000
Property, plant and equipment, net 164,547,000 135,755,000
Other assets:    
Investment in affiliate 2,910,000 4,016,000
Goodwill 1,724,000 1,724,000
Other, net 4,722,000 3,818,000
Total other assets 9,356,000 9,558,000
Total assets 502,009,000 387,981,000
Current liabilities:    
Accounts payable 57,891,000 51,025,000
Short-term financing 5,646,000 3,821,000
Accrued and other liabilities 28,677,000 31,507,000
Current portion of long-term debt 4,935,000 2,328,000
Total current liabilities 97,149,000 88,681,000
Long-term debt 74,525,000 93,064,000
Noncurrent accrued and other liabilities 15,239,000 12,605,000
Deferred income taxes 21,826,000 14,261,000
Commitments and contingencies (Note 11)      
Stockholders' equity:    
Common stock, $.10 par value; 75,000,000 shares authorized, 26,638,285 shares issued (25,476,534 shares at December 31, 2010) 2,664,000 2,548,000
Capital in excess of par value 162,092,000 131,845,000
Retained earnings 153,888,000 70,351,000
Stockholders equity including treasury stock 321,644,000 207,744,000
Less treasury stock, at cost:    
Common stock, 4,320,462 shares 28,374,000 28,374,000
Total stockholders' equity 293,270,000 179,370,000
Total Liabilities and Stockholders' equity 502,009,000 387,981,000
Series B Preferred stock
    
Stockholders' equity:    
Convertible preferred stock 2,000,000 2,000,000
Series D Preferred stock
    
Stockholders' equity:    
Convertible preferred stock $ 1,000,000 $ 1,000,000