Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT IN AMAK (Details)

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INVESTMENT IN AMAK (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
SAR / $
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
SAR / $
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Schedule of Equity Method Investments [Line Items]          
Equity in earnings (loss) of AMAK $ 1,801 $ (369) $ 7,168 $ (310)  
Results of Operations [Abstract]          
Loss from operations 5,896 9,491 12,041 19,224  
AMAK [Member]          
Related Party Transaction [Line Items]          
Investment in AMAK $ 54,900   $ 54,900   $ 47,700
Schedule of Equity Method Investments [Line Items]          
Percentage investment in AMAK 35.25%   35.25%    
AMAK [Member]          
Schedule of Equity Method Investments [Line Items]          
Percentage investment in AMAK 35.00%   35.00%   35.00%
Exchange rate | SAR / $ 3.75   3.75    
Company's share of income (loss) reported by AMAK $ 1,464 (706) $ 6,494 (984)  
Amortization of difference between Company's investment in AMAK and Company's share of net assets of AMAK 337 337 674 674  
Equity in earnings (loss) of AMAK 1,801 (369) 7,168 (310)  
Results of Operations [Abstract]          
Sales 610 13,283 9,602 18,584  
Gross profit (loss) (3,000) 1,034 (2,809) 2,746  
General, administrative and other expenses 2,043 3,036 4,189 5,538  
Loss from operations (5,043) (2,002) (6,998) (2,792)  
Gain on settlement with former operator 9,195 0 25,421 0  
Net income (loss) 4,152 (2,002) 18,423 (2,792)  
Depreciation, depletion and amortization 2,400 5,900 5,100 11,000  
Net income before depreciation and amortization 6,223 $ 3,903 23,201 $ 8,223  
Financial Position [Abstract]          
Current assets 18,746   18,746   $ 26,078
Noncurrent assets 263,446   263,446   259,527
Total assets 282,192   282,192   285,605
Current liabilities 2,654   2,654   22,740
Long term liabilities 87,935   87,935   89,364
Shareholders' equity 191,603   191,603   173,501
Total liabilities and Shareholders' equity $ 282,192   $ 282,192   $ 285,605