| Date | Form | Description | XBRL | Pages | |
|---|---|---|---|---|---|
| 06/01/15 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 06/01/15 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 06/01/15 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 06/01/15 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  4 | |
| 06/01/15 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 06/01/15 | 4 | Statement of changes in beneficial ownership of securities | 
       
   | 
  2 | |
| 05/29/15 | SD | Specialized Disclosure Report filed pursuant to Section 1502 of the Dodd-Frank Wall Street Reform and Consumer Protection Act relating to the use of conflict minerals (Rule 13p-1) | 
       
   | 
  3 | |
| 05/29/15 | 8-K | Current report filing | 
       
   | 
  15 | |
| 04/02/15 | 8-K | Current report filing | 
       
   | 
  3 | |
| 03/23/15 | 8-K | Current report filing | 
       
   | 
  3 | 
