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Segment Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Segment
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Segment Reporting Information [Line Items]          
Number of reportable segments | Segment     2    
Segment Reporting Information, Results of operations [Abstract]          
Total interest expense $ 56 $ 93 $ 201 $ 307  
Operating income (loss) from identified segments (25,224) (681) (54,670) 715  
General and administrative expenses (1,824) (2,030) (4,524) (5,169)  
Add back Interest expenses 56 93 201 307  
Other revenues and expenses 1,573 618 1,036 (472)  
Income (loss) before income taxes (23,651) (63) (53,634) 243  
Depreciation depletion and amortization expense [Abstract]          
Total depreciation depletion amortization expense 2,243 4,689 7,306 11,702  
Assets by segment [Abstract]          
Total Assets 71,502   71,502   $ 123,523
Reportable Segment [Member]          
Segment Reporting Information, Results of operations [Abstract]          
Total revenues 2,622 9,928 8,586 27,312  
Total operating expenses 26,022 8,579 58,732 21,428  
Total interest expense 56 93 201 307  
Operating income (loss) from identified segments (23,456) 1,256 (50,347) 5,577  
Add back Interest expenses 56 93 201 307  
Reportable Segment [Member] | Oil and gas [Member]          
Segment Reporting Information, Results of operations [Abstract]          
Total revenues 2,622 9,928 8,586 27,312  
Total operating expenses 25,187 7,649 56,437 19,084  
Total interest expense 56 93 201 307  
Operating income (loss) from identified segments (22,621) 2,186 (48,052) 7,921  
Add back Interest expenses 56 93 201 307  
Depreciation depletion and amortization expense [Abstract]          
Total depreciation depletion amortization expense 2,176 4,621 7,105 11,498  
Assets by segment [Abstract]          
Total Assets 43,389   43,389   92,020
Reportable Segment [Member] | Mineral properties [Member]          
Segment Reporting Information, Results of operations [Abstract]          
Total operating expenses 835 930 2,295 2,344  
Total interest expense 0 0 0 0  
Operating income (loss) from identified segments (835) (930) (2,295) (2,344)  
Add back Interest expenses 0 0 0 0  
Depreciation depletion and amortization expense [Abstract]          
Total depreciation depletion amortization expense 31 31 93 92  
Assets by segment [Abstract]          
Total Assets 21,944   21,944   21,942
Corporate, Non-Segment [Member]          
Depreciation depletion and amortization expense [Abstract]          
Total depreciation depletion amortization expense 36 $ 37 108 $ 112  
Assets by segment [Abstract]          
Total Assets $ 6,169   $ 6,169   $ 9,561