| Date Filed | Type | Description |
| 03/15/2012 |
10-K/A
| Annual Report for the period ended December 31, 2011 [amend] |
| 03/15/2012 |
10-K
| Annual Report for the period ended December 31, 2011 |
| 07/15/2011 |
10-K/A
| Annual Report for the period ended December 31, 2010 [amend] |
| 07/08/2011 |
10-K/A
| Annual Report for the period ended December 31, 2010 [amend] |
| 03/29/2011 |
10-K
| Annual Report for the period ended December 31, 2010 |
| 03/11/2010 |
10-K
| Annual Report for the period ended December 31, 2009 |
| 03/12/2009 |
10-K
| Annual Report for the period ended December 31, 2008 |
| 03/11/2008 |
10-K
| Annual Report for the period ended December 31, 2007 |
| 03/14/2007 |
10-K
| Annual Report for the period ended December 31, 2006 |
| 03/16/2006 |
10-K
| Annual Report for the period ended December 31, 2005 |
| 04/29/2005 |
10-K/A
| Annual Report for the period ended March 31, 2005 [amend] |
| 03/31/2005 |
10-K
| Annual Report for the period ended December 31, 2004 |
| 03/12/2004 |
10-K
| Annual Report for the period ended December 31, 2003 |
| 03/31/2003 |
10-K
| Annual Report for the period ended December 31, 2002 |
| 03/27/2002 |
10-K
| Annual Report for the period ended December 31, 2001 |
| 03/30/2001 |
10-K
| Annual Report for the period ended December 31, 2000 |
| 03/29/2000 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 03/29/1999 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 03/30/1998 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 03/24/1997 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 03/25/1996 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |