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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 132,708 $ 186,811
Restricted cash 238 365
Short-term investments 25,000 14,500
Accounts receivable, net 85,343 88,074
Inventories:    
Finished goods 25,440 28,218
Work in progress 2,505 2,763
Raw materials 26,109 25,605
Total inventories 54,054 56,586
Supplies, prepaid items and other:    
Prepaid insurance 6,305 13,752
Precious metals 14,116 12,838
Supplies 16,827 15,927
Prepaid and refundable income taxes 2,972 7,387
Other 6,555 5,438
Total supplies, prepaid items and other 46,775 55,342
Deferred income taxes 15,998 17,204
Total current assets 360,116 418,882
Property, plant and equipment, net 787,465 619,205
Other assets:    
Noncurrent restricted cash and cash equivalents   45,969
Noncurrent restricted investments   25,000
Other, net 30,598 27,949
Total other assets 30,598 98,918
Total assets 1,178,179 1,137,005
Current liabilities:    
Accounts payable 106,317 81,456
Short-term financing 4,805 11,955
Accrued and other liabilities 49,195 51,166
Current portion of long-term debt 24,095 10,680
Total current liabilities 184,412 155,257
Long-term debt 446,091 446,638
Noncurrent accrued and other liabilities 18,432 17,934
Deferred income taxes $ 85,391 $ 83,128
Commitments and contingencies (Note 9)    
Stockholders' equity:    
Common stock, $.10 par value; 75,000,000 shares authorized, 27,109,544 shares issued (26,968,212 shares at December 31, 2014) $ 2,711 $ 2,697
Capital in excess of par value 173,562 170,537
Retained earnings 292,954 286,188
Stockholders equity including treasury stock 472,227 462,422
Less treasury stock, at cost:    
Common stock, 4,320,462 shares 28,374 28,374
Total stockholders' equity 443,853 434,048
Total Liabilities and Stockholders' equity 1,178,179 1,137,005
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