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RESTATEMENT (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
 [2]
Mar. 31, 2013
 [3]
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Earnings Per Share [Abstract]                                  
Earnings Per Share, Basic $ (1.58) $ (0.47) $ (0.40) $ 0.02 $ (1.58) [1] $ (0.47) $ (0.40) $ 0.02 $ (0.29) $ 0.15 $ 0.43 $ 0.38 $ (2.43) $ 0.66 $ 2.47    
Impact of Restatement on Earnings Per Share, Basic (0.59) (0.30) (0.02) (0.02)                 (0.93)        
Earnings Per Share, Diluted (1.58) (0.47) (0.40) 0.02 $ (1.58) [1] $ (0.47) $ (0.40) $ 0.02 $ (0.29) $ 0.15 $ 0.40 $ 0.34 (2.43) $ 0.64 $ 2.05    
Impact of Restatement on Earnings Per Share, Diluted $ 0 0 0 0                 $ 0        
Statement of Financial Position [Abstract]                                  
Cash and Cash Equivalents, at Carrying Value $ 201,451       $ 189,360       $ 189,114       $ 201,451 $ 189,360 $ 189,114 $ 129,170 $ 129,170
Restricted cash 0       14,268               0 14,268      
Accounts Receivable, Net, Current 199,378       263,053               199,378 263,053      
Inventory, Net 331,432       384,920               331,432 384,920      
Deferred Tax Assets, Net of Valuation Allowance, Current 23,435       41,931               23,435 41,931      
Prepaid Expense and Other Assets, Current 80,234       114,346               80,234 114,346      
Assets, Current 835,930       1,007,878               835,930 1,007,878      
Property, Plant and Equipment, Net 527,414       638,807               527,414 638,807      
Goodwill 0       42,075       24,941       0 42,075 24,941    
Deferred income taxes 15,623       2,772               15,623 2,772      
Other Assets, Noncurrent 116,757       129,699               116,757 129,699      
Assets 1,495,724       1,821,231       1,710,235       1,495,724 1,821,231 1,710,235    
Short-term Debt 26,233       75,061               26,233 75,061      
Accounts Payable, Current 146,305       176,719               146,305 176,719      
Other current liabilities 129,018       134,791               129,018 134,791      
Liabilities, Current 301,556       386,571               301,556 386,571      
Long-term debt 496,503       497,694               496,503 497,694      
Deferred income taxes 18,582       60,985               18,582 60,985      
Other long-term liabilities 89,025       77,945               89,025 77,945      
Liabilities 905,666       1,023,195               905,666 1,023,195      
Redeemable Noncontrolling Interest, Equity, Carrying Amount 71,192       89,155               71,192 89,155      
Common stock (no par, 120,000,000 shares authorized, 55,253,092 issued) 0       0               0 0      
Additional paid-in capital 513,090       558,637               513,090 558,637      
Retained earnings 126,007       207,541               126,007 207,541      
Treasury Stock, Value 13,897       15,586               13,897 15,586      
Common Stock, Shares Held in Employee Trust 1,075       1,075               1,075 1,075      
Accumulated other comprehensive loss (112,630)       (61,794)       (56,469)       (112,630) (61,794) (56,469)    
Stockholders' Equity Attributable to Parent 511,495       687,723               511,495 687,723      
Stockholders' Equity Attributable to Noncontrolling Interest 7,371       21,158               7,371 21,158      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 518,866       708,881       $ 632,362       518,866 708,881 $ 632,362 $ 396,879  
Liabilities and Equity 1,495,724       1,821,231               1,495,724 1,821,231      
Restatement Adjustment [Member]                                  
Statement of Financial Position [Abstract]                                  
Cash and Cash Equivalents, at Carrying Value 0       0               0 0      
Restricted cash         0                 0      
Accounts Receivable, Net, Current 0       0               0 0      
Inventory, Net 0       0               0 0      
Deferred Tax Assets, Net of Valuation Allowance, Current 0       0               0 0      
Prepaid Expense and Other Assets, Current 0       0               0 0      
Assets, Current 0       0               0 0      
Property, Plant and Equipment, Net 0       0               0 0      
Goodwill         0                 0      
Deferred income taxes 0       0               0 0      
Other Assets, Noncurrent 0       0               0 0      
Assets 0       0               0 0      
Short-term Debt 0       0               0 0      
Accounts Payable, Current 0       0               0 0      
Other current liabilities 0       0               0 0      
Liabilities, Current 0       0               0 0      
Long-term debt 0       0               0 0      
Deferred income taxes 0       0               0 0      
Other long-term liabilities 0       0               0 0      
Liabilities 0       0               0 0      
Redeemable Noncontrolling Interest, Equity, Carrying Amount 71,192       89,155               71,192 89,155      
Common stock (no par, 120,000,000 shares authorized, 55,253,092 issued) 0       0               0 0      
Additional paid-in capital (49,277)       0               (49,277) 0      
Retained earnings 0       0               0 0      
Treasury Stock, Value 0       0               0 0      
Common Stock, Shares Held in Employee Trust 0       0               0 0      
Accumulated other comprehensive loss 0       0               0 0      
Stockholders' Equity Attributable to Parent (49,277)       0               (49,277) 0      
Stockholders' Equity Attributable to Noncontrolling Interest (21,915)       (89,155)               (21,915) (89,155)      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (71,192)       (89,155)               (71,192) (89,155)      
Liabilities and Equity 0       0               0 0      
Scenario, Previously Reported [Member]                                  
Statement of Financial Position [Abstract]                                  
Redeemable Noncontrolling Interest, Equity, Carrying Amount 0       0               0 0      
Additional paid-in capital 562,367                       562,367        
Stockholders' Equity Attributable to Parent 560,772                       560,772        
Stockholders' Equity Attributable to Noncontrolling Interest 29,286       110,313               29,286 110,313      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 590,058       $ 798,036               $ 590,058 $ 798,036      
Scenario, Previously Reported [Member]                                  
Earnings Per Share [Abstract]                                  
Earnings Per Share, Basic $ (0.99) (0.17) (0.38) 0.04                 $ (1.50)        
Earnings Per Share, Diluted $ (0.99) $ (0.17) $ (0.38) $ 0.04                 $ (1.50)        
[1] Loss on senior note repurchase of $22.7 million was included in the quarter ended December 31, 2013.
[2] Gain on earthquake insurance recovery of $22.5 million was included in the quarter ended June 30, 2013.
[3] (a) Mining asset impairment and inventory writedown of $34.8 million was included in the quarter ended June 30, 2014.