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Asset Retirement Obligation (Tables)
 12 Months Ended
Dec. 31, 2012
Asset Retirement Obligation Disclosure [Abstract]  
Changes in Asset Retirement Obligation
The following summary sets forth the annual changes to the Company’s asset retirement obligation in 2012, 2011 and 2010: 
(In thousands)
 
Stillwater
Mine
 
East
Boulder
Mine
 
Total
Balance at December 31, 2009
 
$
5,755

 
$
454

 
$
6,209

Accretion expense
 
498

 
40

 
538

Balance at December 31, 2010
 
$
6,253

 
$
494

 
$
6,747

Accretion expense
 
541

 
43

 
584

Balance at December 31, 2011
 
$
6,794

 
$
537

 
$
7,331

Accretion expense
 
587

 
47

 
634

Balance at December 31, 2012
 
$
7,381

 
$
584

 
$
7,965