Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT IN AMAK (Details)

v3.7.0.1
INVESTMENT IN AMAK (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jul. 31, 2016
$ / shares
shares
Sep. 30, 2016
USD ($)
SAR / $
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
SAR / $
Sep. 30, 2015
USD ($)
Jul. 31, 2016
SAR / shares
shares
Jun. 30, 2016
Dec. 31, 2015
USD ($)
Schedule of Equity Method Investments [Line Items]                
Gain from additional equity issued by AMAK   $ 3,168 [1] $ 0 $ 3,168 [1] $ 0      
Equity in earnings (loss) of AMAK   (2,089) [1] (2,054) 2,261 [1] (2,364)      
Results of Operations [Abstract]                
Loss from operations   4,128 11,063 16,169 30,287      
AMAK [Member]                
Related Party Transaction [Line Items]                
Investment in AMAK   $ 53,100   $ 53,100       $ 47,700
AMAK [Member]                
Schedule of Equity Method Investments [Line Items]                
Percentage investment in AMAK 33.44% 33.44%   33.44%   33.44% 35.25% 35.25%
Gain from additional equity issued by AMAK       $ 3,200        
Exchange rate | SAR / $   3.75   3.75        
AMAK Net Income (Loss)   $ (7,210) [1] (6,778) $ 2,898 [1] (9,570)      
Zakat tax applicable to Saudi Arabian shareholders only   0 0 320 [1] 0      
AMAK Net Income (Loss) before Saudi Arabian shareholders' portion of Zakat   (7,210) (6,778) 3,218 [1] (9,570)      
Company's share of income (loss) reported by AMAK   (2,426) (2,391) 1,250 [1] (3,375)      
Amortization of difference between Company's investment in AMAK and Company's share of net assets of AMAK   337 337 1,011 [1] 1,011      
Equity in earnings (loss) of AMAK   (2,089) (2,054) 2,261 [1] (2,364)      
Shares issued (in shares) | shares 4,000,000              
Results of Operations [Abstract]                
Sales   318 [1] 19,874 9,921 [1] 38,458      
Gross profit (loss)   (4,747) [1] (2,711) (7,556) [1] 35      
General, administrative and other expenses   2,463 [1] 4,067 6,986 [1] 9,605      
Loss from operations   (7,210) [1] (6,778) (14,542) [1] (9,570)      
Gain on settlement with former operator   0 [1] 0 17,440 [1] 0      
Net income (loss)   (7,210) [1] (6,778) 2,898 [1] (9,570)      
Depreciation, depletion and amortization   3,200 4,200 8,600 15,300      
Net income (loss) before depreciation and amortization   (4,021) [1] $ (2,543) 11,504 [1] $ 5,680      
Financial Position [Abstract]                
Current assets   27,159 [1]   27,159 [1]       $ 26,078
Noncurrent assets   260,142 [1]   260,142 [1]       259,527
Total assets   287,301 [1]   287,301 [1]       285,605
Current liabilities   2,883 [1]   2,883 [1]       22,740
Long term liabilities   87,994 [1]   87,994 [1]       89,364
Shareholders' equity   196,424 [1]   196,424 [1]       173,501
Total liabilities and Shareholders' equity   $ 287,301 [1]   $ 287,301 [1]       $ 285,605
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    
[1] Restated - See Note 3.