| Date Filed | Type | Description |
| 04/02/2012 |
10-K/A
| Annual Report for the period ended December 31, 2011 [amend] |
| 02/22/2012 |
10-K
| Annual Report for the period ended December 31, 2011 |
| 02/16/2011 |
10-K
| Annual Report for the period ended December 31, 2010 |
| 02/24/2010 |
10-K
| Annual Report for the period ended December 31, 2009 |
| 02/25/2009 |
10-K
| Annual Report for the period ended December 31, 2008 |
| 02/21/2008 |
10-K
| Annual Report for the period ended December 31, 2007 |
| 02/21/2008 |
AR
| 2007 Annual Report |
| 02/08/2007 |
10-K
| Annual Report for the period ended December 31, 2006 |
| 02/08/2007 |
AR
| 2006 Annual Report |
| 05/05/2006 |
10-K/A
| Annual Report for the period ended December 31, 2005 [amend] |
| 02/23/2006 |
AR
| 2005 Annual Report |
| 02/22/2006 |
10-K
| Annual Report for the period ended December 31, 2005 |
| 03/03/2005 |
10-K
| Annual Report for the period ended December 31, 2004 |
| 02/25/2004 |
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 |
| 03/08/2002 |
10-K
| Annual Report for the period ended December 31, 2001 |
| 03/01/2001 |
10-K
| Annual Report for the period ended December 31, 2000 |
| 03/29/2000 |
10-K
| Annual Report for the period ended December 31, 1999 |
| 06/10/1999 |
10-K/A
| Annual Report for the period ended December 31, 1998 [amend] |
| 03/29/1999 |
10-K
| Annual Report for the period ended December 31, 1998 |
| 03/27/1998 |
10-K
| Annual Report for the period ended December 31, 1997 |
| 03/26/1997 |
10-K
| Annual Report for the period ended December 31, 1996 |