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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 68,670 $ 98,020
Restricted cash 113 31
Accounts receivable, net 93,224 82,801
Inventories:    
Finished goods 42,648 36,851
Work in progress 3,537 3,576
Raw materials 24,440 24,546
Total inventories 70,625 64,973
Supplies, prepaid items and other:    
Prepaid insurance 7,561 10,049
Precious metals 13,044 13,528
Supplies 10,625 9,855
Fair value of derivatives and other 312 170
Prepaid income taxes 10,122   
Other 2,086 2,096
Total supplies, prepaid items and other 43,750 35,698
Deferred income taxes 3,206 3,224
Total current assets 279,588 284,747
Property, plant and equipment, net 324,644 281,871
Other assets:    
Investment in affiliate 1,551 1,809
Goodwill 1,724 1,724
Other, net 6,658 6,461
Total other assets 9,933 9,994
Total assets 614,165 576,612
Current liabilities:    
Accounts payable 69,752 68,333
Short-term financing 6,472 9,254
Accrued and other liabilities 29,887 34,698
Deferred gain on insurance recoveries 9,617   
Current portion of long-term debt 11,304 4,798
Total current liabilities 127,032 117,083
Long-term debt 94,456 67,643
Noncurrent accrued and other liabilities 16,433 16,369
Deferred income taxes 21,342 21,020
Commitments and contingencies (Note 9)      
Stockholders' equity:    
Common stock, $.10 par value; 75,000,000 shares authorized, 26,756,190 shares issued (26,731,360 at December 31, 2012) 2,676 2,673
Capital in excess of par value 165,776 165,006
Retained earnings 211,824 212,192
Stockholders equity including treasury stock 383,276 382,871
Less treasury stock, at cost:    
Common stock, 4,320,462 shares 28,374 28,374
Total stockholders' equity 354,902 354,497
Total Liabilities and Stockholders' equity 614,165 576,612
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