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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Current assets:    
Cash and cash equivalents $ 113,342 $ 124,929
Restricted cash 31 31
Short-term investments 10,005 10,005
Accounts receivable, net 87,524 87,351
Inventories:    
Finished goods 34,070 29,009
Work in process 4,000 4,855
Raw materials 30,554 25,642
Total inventories 68,624 59,506
Supplies, prepaid items and other:    
Prepaid insurance 4,290 5,953
Precious metals 16,085 17,777
Supplies 8,734 7,513
Fair value of derivatives and other 195 53
Prepaid income taxes 6,948 8,679
Other 3,003 2,034
Total supplies, prepaid items and other 39,255 42,009
Deferred income taxes 3,758 4,275
Total current assets 322,539 328,106
Property, plant and equipment, net 171,874 164,547
Other assets:    
Investment in affiliate 2,652 2,910
Goodwill 1,724 1,724
Other, net 6,205 4,722
Total other assets 10,581 9,356
Total assets 504,994 502,009
Current liabilities:    
Accounts payable 48,798 57,891
Short-term financing 3,962 5,646
Accrued and other liabilities 30,022 28,677
Current portion of long-term debt 4,773 4,935
Total current liabilities 87,555 97,149
Long-term debt 71,248 74,525
Noncurrent accrued and other liabilities 15,492 15,239
Deferred income taxes 22,646 21,826
Commitments and contingencies (Note 8)      
Stockholders' equity:    
Common stock, $.10 par value; 75,000,000 shares authorized, 26,659,530 shares issued (26,638,285 shares at December 31, 2011) 2,666 2,664
Capital in excess of par value 162,870 162,092
Retained earnings 167,891 153,888
Stockholders equity including treasury stock 336,427 321,644
Less treasury stock, at cost:    
Common stock, 4,320,462 shares 28,374 28,374
Total stockholders' equity 308,053 293,270
Total Liabilities and Stockholders' equity 504,994 502,009
Series B preferred stock
    
Stockholders' equity:    
Convertible preferred stock 2,000 2,000
Series D preferred stock
    
Stockholders' equity:    
Convertible preferred stock $ 1,000 $ 1,000