| Date Filed | Type | Description |
| 03/06/2012 |
10-K
| Annual Report for the period ended December 31, 2011 |
| 03/03/2011 |
10-K
| Annual Report for the period ended December 31, 2010 |
| 04/27/2010 |
10-K/A
| Annual Report for the period ended December 31, 2009 [amend] |
| 03/04/2010 |
10-K
| Annual Report for the period ended December 31, 2009 |
| 03/11/2009 |
10-K
| Annual Report for the period ended December 31, 2008 |
| 03/10/2008 |
10-K
| Annual Report for the period ended December 31, 2007 |
| 03/16/2007 |
10-K
| Annual Report for the period ended December 31, 2006 |
| 03/09/2006 |
10-K
| Annual Report for the period ended December 31, 2005 |
| 03/15/2005 |
10-K
| Annual Report for the period ended December 31, 2004 |
| 03/16/2004 |
10-K
| Annual Report for the period ended December 31, 2003 |
| 03/11/2003 |
10-K
| Annual Report for the period ended December 31, 2002 |
| 03/15/2002 |
10-K
| Annual Report for the period ended December 31, 2001 |
| 03/16/2001 |
10-K
| Annual Report for the period ended December 31, 2000 |
| 03/21/2000 |
10-K/A
| Annual Report for the period ended December 31, 1999 [amend] |
| 03/03/2000 |
10-K
| Annual Report for the period ended December 31, 1999 |
| 06/18/1999 |
10-K/A
| Annual Report for the period ended December 31, 1998 [amend] |
| 02/26/1999 |
10-K
| Annual Report for the period ended December 31, 1998 |
| 03/12/1998 |
10-K
| Annual Report for the period ended December 31, 1997 |
| 03/24/1997 |
10-K
| Annual Report for the period ended December 31, 1996 |