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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 65,572 $ 98,020
Restricted cash 780 31
Accounts receivable, net 96,480 82,801
Inventories:    
Finished goods 31,138 36,851
Work in progress 2,582 3,576
Raw materials 25,003 24,546
Total inventories 58,723 64,973
Supplies, prepaid items and other:    
Prepaid insurance 4,508 10,049
Precious metals 11,901 13,528
Supplies 11,450 9,855
Fair value of derivatives and other 625 170
Prepaid income taxes 10,120  
Other 2,102 2,096
Total supplies, prepaid items and other 40,706 35,698
Deferred income taxes 3,396 3,224
Total current assets 265,657 284,747
Property, plant and equipment, net 346,328 281,871
Other assets:    
Investment in affiliate 1,294 1,809
Goodwill 1,724 1,724
Other, net 7,286 6,461
Total other assets 10,304 9,994
Total assets 622,289 576,612
Current liabilities:    
Accounts payable 59,279 68,333
Short-term financing 3,677 9,254
Accrued and other liabilities 27,912 34,698
Deferred gain on insurance recoveries 20,707  
Current portion of long-term debt 11,718 4,798
Total current liabilities 123,293 117,083
Long-term debt 96,147 67,643
Noncurrent accrued and other liabilities 16,359 16,369
Deferred income taxes 23,733 21,020
Commitments and contingencies (Note 9)      
Stockholders' equity:    
Common stock, $.10 par value; 75,000,000 shares authorized, 26,761,990 shares issued (26,731,360 at December 31, 2012) 2,676 2,673
Capital in excess of par value 166,204 165,006
Retained earnings 219,251 212,192
Stockholders equity including treasury stock 391,131 382,871
Less treasury stock, at cost:    
Common stock, 4,320,462 shares 28,374 28,374
Total stockholders' equity 362,757 354,497
Total Liabilities and Stockholders' equity 622,289 576,612
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