| Date Filed | Type | Description |
| 04/30/2012 |
10-K/A
| Annual Report for the period ended December 31, 2011 [amend] |
| 02/24/2012 |
10-K
| Annual Report for the period ended December 31, 2011 |
| 02/25/2011 |
10-K
| Annual Report for the period ended December 31, 2010 |
| 02/17/2010 |
10-K
| Annual Report for the period ended December 31, 2009 |
| 02/19/2009 |
10-K
| Annual Report for the period ended December 31, 2008 |
| 03/18/2008 |
10-K/A
| Annual Report for the period ended December 31, 2007 [amend] |
| 02/27/2008 |
10-K
| Annual Report for the period ended December 31, 2007 |
| 03/28/2007 |
10-K/A
| Annual Report for the period ended December 31, 2006 [amend] |
| 03/06/2007 |
10-K
| Annual Report for the period ended December 31, 2006 |
| 03/31/2006 |
10-K/A
| Annual Report for the period ended December 31, 2005 [amend] |
| 03/14/2006 |
10-K
| Annual Report for the period ended December 31, 2005 |
| 03/09/2005 |
10-K
| Annual Report for the period ended December 31, 2004 |
| 03/18/2004 |
10-K/A
| Annual Report for the period ended December 31, 2003 [amend] |
| 03/15/2004 |
10-K
| Annual Report for the period ended December 31, 2003 |
| 03/06/2003 |
10-K
| Annual Report for the period ended December 31, 2002 |
| 05/03/2002 |
10-K/A
| Annual Report for the period ended December 31, 2001 [amend] |
| 03/07/2002 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 03/08/2001 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 03/10/2000 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 03/16/1999 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 03/13/1998 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |