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Stock-Based Compensation (Restricted Stock) (Details)
12 Months Ended
Feb. 23, 2015
USD ($)
$ / shares
shares
Sep. 19, 2013
USD ($)
$ / shares
shares
Sep. 15, 2012
USD ($)
$ / shares
shares
May 31, 2012
USD ($)
$ / shares
shares
Dec. 31, 2016
oz
$ / shares
shares
Dec. 31, 2011
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of shares of common stock that may be delivered | shares           6,000,000
Restricted stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share granted | shares 60,000 659,500 525,000 755,000 0  
Average performance period         90 days  
Stock fair value per share (in dollars per share) | $ / shares $ 0.74 $ 1.95 $ 2.98 $ 2.02 $ 0.00  
Stock fair value | $ $ 44,400 $ 1,300,000 $ 1,600,000 $ 1,500,000    
Expiration of stock awards         5 years  
Group One | Restricted stock | Level of Proven and Probable Reserves            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of gold equivalent ounces         1,000,000  
Group One | Restricted stock | Annual Mining Production Level            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of gold equivalent ounces         15,000  
Group Two | Restricted stock | Level of Proven and Probable Reserves            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of gold equivalent ounces         1,500,000  
Group Two | Restricted stock | Annual Mining Production Level            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of gold equivalent ounces         17,500  
Group Three | Restricted stock | Level of Proven and Probable Reserves            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of gold equivalent ounces         2,000,000  
Group Three | Restricted stock | Annual Mining Production Level            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of gold equivalent ounces         20,000  
Group Four | Restricted stock | Level of Proven and Probable Reserves            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of gold equivalent ounces         3,250,000