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Property, Plant and Equipment - Schedule of Mineral Property Expenditures (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Total expense for the period $ 4,470 $ 3,502
Temrezli Project Turkey [Member]    
Total expense for the period 407
Total Turkey Projects [Member]    
Total expense for the period 407
Kingsville Dome Project Texas [Member]    
Total expense for the period 812 $ 862
Rosita Project Texas [Member]    
Total expense for the period 711 817
Vasquez Project Texas [Member]    
Total expense for the period 510 518
Butler Ranch Project Texas [Member]    
Total expense for the period 443 32
Other Projects Texas [Member]    
Total expense for the period 553 12
Total Texas Projects [Member]    
Total expense for the period 3,029 2,241
Crownpoint Project New Mexico [Member]    
Total expense for the period 5 5
Churchrock Project New Mexico [Member]    
Total expense for the period 21 109
Cebolleta Project New Mexico [Member]    
Total expense for the period 537 571
Juan Tafoya Project New Mexico [Member]    
Total expense for the period 384 413
Other Projects New Mexico [Member]    
Total expense for the period 87 163
Total New Mexico Projects [Member]    
Total expense for the period $ 1,034 $ 1,261