| Date Filed | Type | Description |
| 02/28/2012 |
10-K
| Annual Report for the period ended December 31, 2011 |
| 02/28/2011 |
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 |
| 02/27/2008 |
10-K
| Annual Report for the period ended December 31, 2007 |
| 02/27/2008 |
AR
| 2007 Annual Report |
| 02/26/2007 |
10-K
| Annual Report for the period ended December 31, 2006 |
| 02/26/2007 |
AR
| 2006 Annual Report |
| 03/03/2006 |
10-K
| Annual Report for the period ended December 31, 2005 |
| 03/03/2006 |
AR
| 2005 Annual Report |
| 03/04/2005 |
10-K
| Annual Report for the period ended December 31, 2004 |
| 03/04/2005 |
AR
| 2004 Annual Report |
| 03/05/2004 |
10-K
| Annual Report for the period ended December 31, 2003 |
| 03/05/2004 |
AR
| 2003 Annual Report |
| 03/07/2003 |
10-K
| Annual Report for the period ended December 31, 2002 |
| 03/07/2002 |
10-K
| Annual Report for the period ended December 31, 2001 |
| 03/01/2001 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 06/27/2000 |
10-K/A
| Annual Report for the period ended December 31, 1999 [amend] |
| 03/03/2000 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 06/29/1999 |
10-K/A
| Annual Report for the period ended December 31, 1998 [amend] |
| 03/05/1999 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 06/25/1998 |
10-K/A
| Annual Report for the period ended December 31, 1997 [amend] |
| 03/06/1998 |
10-K
| Annual Report for the period ended December 31, 1997 |
| 06/13/1997 |
10-K/A
| Annual Report for the period ended December 31, 1996 [amend] |
| 03/07/1997 |
10-K
| Annual Report for the period ended December 31, 1996 |
| 06/14/1996 |
10-K/A
| Annual Report for the period ended December 31, 1995 [amend] |
| 04/22/1996 |
10-K/A
| Annual Report for the period ended December 31, 1995 [amend] |
| 03/07/1996 |
10-K
| Annual Report for the period ended December 31, 1995 |
| 06/28/1995 |
10-K/A
| Annual Report for the period ended December 31, 1994 [amend] |
| 04/12/1995 |
10-K/A
| Annual Report for the period ended December 31, 1994 [amend] |
| 03/03/1995 |
10-K
| Annual Report for the period ended December 31, 1994 |
| 06/23/1994 |
10-K/A
| Annual Report for the period ended December 31, 1993 [amend] |
| 04/28/1994 |
10-K/A
| Annual Report for the period ended December 31, 1993 [amend] |
| 03/03/1994 |
10-K
| Annual Report for the period ended December 31, 1993 |