| Date | Form | Description | XBRL | Pages | |
|---|---|---|---|---|---|
| 03/13/12 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 03/12/12 | DEFA14A | Additional definitive proxy soliciting materials and Rule 14(a)(12) material | 
       
   | 
  3 | |
| 03/12/12 | DEF 14A | Definitive proxy statements | 
       
   | 
  59 | |
| 03/09/12 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 03/06/12 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 03/06/12 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 03/05/12 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 03/05/12 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 03/02/12 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 03/02/12 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | 

