Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT IN AMAK (Details)

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INVESTMENT IN AMAK (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2016
$ / shares
shares
Jun. 30, 2017
USD ($)
SAR / $
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
SAR / $
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Jul. 31, 2016
SAR / shares
shares
Results of Operations [Abstract]              
Loss from operations   $ 5,162 $ 5,896 $ 9,354 $ 12,041    
Equity in Income or Loss of AMAK Reflected on Consolidated Statement Of Operation [Abstract]              
Equity in earnings (loss) of AMAK   $ (3,298) $ (1,017) $ (4,264) $ 4,350    
AMAK [Member]              
Schedule of Equity Method Investments [Line Items]              
Shares issued (in shares) | shares 4,000,000            
Percentage investment in AMAK 35.25% 33.44% 33.44% 33.44% 33.44% 33.44% 35.25%
Investment in AMAK   $ 45,100   $ 45,100   $ 49,400  
Exchange rate | SAR / $   3.75   3.75      
Results of Operations [Abstract]              
Sales   $ 0 $ 610 $ 2,256 $ 9,602    
Gross loss   (8,901) (3,000) (10,207) (2,809)    
General, administrative and other expenses   1,971 2,361 4,559 4,509    
Loss from operations   (10,872) (5,361) (14,766) (7,318)    
Gain on settlements with former operator   0 1,200 0 17,426    
Net income (loss)   (10,872) (4,161) (14,766) 10,108    
Depreciation and amortization   7,600 2,400 10,700 5,100    
Net income (loss) before depreciation and amortization   (3,263) (1,772) (4,102) 15,206    
Financial Position [Abstract]              
Current assets   16,113   16,113   22,860  
Noncurrent assets   253,233   253,233   251,741  
Total assets   269,346   269,346   274,601  
Current liabilities   16,609   16,609   8,005  
Long term liabilities   83,454   83,454   82,546  
Shareholders' equity   169,283   169,283   184,050  
Total liabilities and Shareholders' equity   269,346   269,346   $ 274,601  
Equity in Income or Loss of AMAK Reflected on Consolidated Statement Of Operation [Abstract]              
AMAK Net income (loss)   (10,872) (4,161) (14,766) 10,108    
Zakat tax applicable to Saudi Arabian shareholders only   0 320 0 320    
AMAK Net Income (Loss) before Saudi Arabian shareholders' portion of Zakat   (10,872) (3,841) (14,766) 10,428    
Company's share of income (loss) reported by AMAK   (3,635) (1,354) (4,938) 3,676    
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   $ (3,298) $ (1,017) $ (4,264) $ 4,350    
Arab Mining Co [Member]              
Schedule of Equity Method Investments [Line Items]              
Shares issued (in shares) | shares 3,750,000            
Share price (in dollars per share) | (per share) $ 5.33           SAR 20.00
Shares reserved for future issuance (in shares) | shares 250,000           250,000