| 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 |
| 03/04/2010 |
10-K
| Annual Report for the period ended December 31, 2009 |
| 03/03/2009 |
10-K
| Annual Report for the period ended December 31, 2008 |
| 02/29/2008 |
10-K
| Annual Report for the period ended December 31, 2007 |
| 02/29/2008 |
AR
| 2007 Annual Report |
| 03/16/2007 |
10-K
| Annual Report for the period ended December 31, 2006 |
| 03/16/2007 |
AR
| 2006 Annual Report |
| 02/26/2007 |
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 |
| 03/15/2005 |
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 |
| 12/18/2003 |
10-K/A
| Annual Report for the period ended December 31, 2002 [amend] |
| 03/18/2003 |
10-K
| Annual Report for the period ended December 31, 2002 |
| 03/20/2002 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 03/13/2001 |
10-K
| Annual Report for the period ended December 31, 2000 |
| 03/22/2000 |
10-K
| Annual Report for the period ended December 31, 1999 |
| 03/31/1999 |
10-K/A
| Annual Report for the period ended December 31, 1998 [amend] |
| 03/19/1999 |
10-K
| Annual Report for the period ended December 31, 1998 |
| 04/01/1998 |
10-K/A
| Annual Report for the period ended December 31, 1997 [amend] |
| 03/20/1998 |
10-K
| Annual Report for the period ended December 31, 1997 |