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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Current assets:    
Cash and cash equivalents $ 138,699,000 $ 124,929,000
Restricted cash 239,000 31,000
Short-term investments 10,006,000 10,005,000
Accounts receivable, net 97,375,000 87,351,000
Inventories:    
Finished goods 24,868,000 29,009,000
Work in progress 4,931,000 4,855,000
Raw materials 28,023,000 25,642,000
Total inventories 57,822,000 59,506,000
Supplies, prepaid items and other:    
Prepaid insurance 2,963,000 5,953,000
Precious metals 15,453,000 17,777,000
Supplies 8,533,000 7,513,000
Fair value of derivatives and other 42,000 53,000
Prepaid income taxes 1,619,000 8,679,000
Other 2,379,000 2,034,000
Total supplies, prepaid items and other 30,989,000 42,009,000
Deferred income taxes 3,505,000 4,275,000
Total current assets 338,635,000 328,106,000
Property, plant and equipment, net 179,009,000 164,547,000
Other assets:    
Investment in affiliate 2,396,000 2,910,000
Goodwill 1,724,000 1,724,000
Other, net 6,332,000 4,722,000
Total other assets 10,452,000 9,356,000
Total assets 528,096,000 502,009,000
Current liabilities:    
Accounts payable 51,002,000 57,891,000
Short-term financing 2,270,000 5,646,000
Accrued and other liabilities 25,407,000 28,677,000
Current portion of long-term debt 4,764,000 4,935,000
Total current liabilities 83,443,000 97,149,000
Long-term debt 70,051,000 74,525,000
Noncurrent accrued and other liabilities 16,310,000 15,239,000
Deferred income taxes 23,595,000 21,826,000
Commitments and contingencies (Note 8)      
Stockholders' equity:    
Common stock, $.10 par value; 75,000,000 shares authorized, 26,679,530 shares issued (26,638,285 at December 31, 2011) 2,668,000 2,664,000
Capital in excess of par value 163,479,000 162,092,000
Retained earnings 193,924,000 153,888,000
Stockholders equity including treasury stock 363,071,000 321,644,000
Less treasury stock at cost:    
Common stock, 4,320,462 shares 28,374,000 28,374,000
Total stockholders' equity 334,697,000 293,270,000
Total Liabilities and Stockholders' equity 528,096,000 502,009,000
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