| Date Filed | Type | Description |
| 04/01/2013 |
10-K
| Annual Report for the period ended December 31, 2012 |
| 02/29/2012 |
10-K
| Annual Report for the period ended December 31, 2011 |
| 03/01/2011 |
10-K
| Annual Report for the period ended December 31, 2010 |
| 03/01/2010 |
10-K
| Annual Report for the period ended December 31, 2009 |
| 03/02/2009 |
10-K
| Annual Report for the period ended December 31, 2008 |
| 03/14/2008 |
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 |
| 03/28/2006 |
10-K
| Annual Report for the period ended December 31, 2005 |
| 01/19/2006 |
10-K/A
| Annual Report for the period ended December 31, 2004 [amend] |
| 03/31/2005 |
10-K/A
| Annual Report for the period ended December 31, 2004 [amend] |
| 03/30/2005 |
10-K
| Annual Report for the period ended December 31, 2004 |
| 04/29/2004 |
10-K/A
| Annual Report for the period ended December 31, 2003 [amend] |
| 03/12/2004 |
10-K
| Annual Report for the period ended December 31, 2003 |
| 04/30/2003 |
10-K/A
| Annual Report for the period ended December 31, 2002 [amend] |
| 03/31/2003 |
10-K
| Annual Report for the period ended December 31, 2002 |
| 09/25/2002 |
10-K/A
| Annual Report for the period ended December 31, 2001 [amend] |
| 03/28/2002 |
10-K
| Annual Report for the period ended December 31, 2001 |
| 04/30/2001 |
10-K/A
| Annual Report for the period ended December 31, 2000 [amend] |
| 03/30/2001 |
10-K
| Annual Report for the period ended December 31, 2000 |
| 04/28/2000 |
10-K/A
| Annual Report for the period ended December 31, 1999 [amend] |
| 03/30/2000 |
10-K
| Annual Report for the period ended December 31, 1999 |
| 03/22/1999 |
10-K
| Annual Report for the period ended December 31, 1998 |
| 03/26/1998 |
10-K
| Annual Report for the period ended December 31, 1997 |
| 03/27/1997 |
10-K
| Annual Report for the period ended December 31, 1996 |
| 04/02/1996 |
10-K/A
| Annual Report for the period ended December 31, 1995 [amend] |
| 04/01/1996 |
10-K
| Annual Report for the period ended December 31, 1995 |