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Share-Based Compensation (Narrative) (Details) (USD $)
Share data in Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
Cash from exercise of stock options       $ 700,000
Share-based compensation expense recorded in General and administrative expense 25,900 61,500 55,300 131,100
Share-based compensation cost related to nonvested stock options to be recognized in remaining months of 2012     41,500  
Share-based compensation cost related to nonvested stock options to be recognized in 2013     32,700  
Share-based compensation cost related to nonvested stock options to be recognized in 2014     500  
Compensation expense related to grants of nonvested shares $ 2,000,000 $ 1,600,000 $ 3,700,000 $ 3,100,000
Fully Vested after One Year [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     1 year  
Vesting percentage     100.00%  
2004 and 2012 Plans Combined [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available and reserved for grant 5.4   5.4  
2012 Equity Incentive Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock shares authorized for issuance 5.0   5.0  
2004 Equity Incentive Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock shares authorized for issuance 5.2   5.2  
General Employee Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock shares authorized for issuance 1.4   1.4  
1994 Incentive Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock shares authorized for issuance 4.8   4.8  
Officers' And Directors' Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award expiration period     10 years  
Other Options [Member] | Minimum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award expiration period     5 years  
Other Options [Member] | Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award expiration period     10 years  
Stillwater Mining Company [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock shares authorized for issuance 16.4   16.4