| Date Filed | Type | Description |
| 04/30/2013 |
10-K/A
| Annual Report for the period ended December 31, 2012 [amend] |
| 03/15/2013 |
10-K
| Annual Report for the period ended December 31, 2012 |
| 04/27/2012 |
10-K/A
| Annual Report for the period ended December 31, 2011 [amend] |
| 02/29/2012 |
10-K
| Annual Report for the period ended December 31, 2011 |
| 05/02/2011 |
10-K/A
| Annual Report for the period ended December 31, 2010 [amend] |
| 03/01/2011 |
10-K
| Annual Report for the period ended December 31, 2010 |
| 03/10/2010 |
10-K
| Annual Report for the period ended December 31, 2009 |
| 03/10/2009 |
10-K
| Annual Report for the period ended December 31, 2008 |
| 03/17/2008 |
10-K
| Annual Report for the period ended December 31, 2007 |
| 11/27/2007 |
10-K/A
| Annual Report for the period ended December 31, 2006 [amend] |
| 04/27/2007 |
10-K/A
| Annual Report for the period ended December 31, 2006 [amend] |
| 04/02/2007 |
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 |
| 01/20/2006 |
10-K/A
| Annual Report for the period ended December 31, 2004 [amend] |
| 05/02/2005 |
10-K/A
| Annual Report for the period ended December 31, 2004 [amend] |
| 03/31/2005 |
10-K
| Annual Report for the period ended December 31, 2004 |
| 04/29/2004 |
10-K/A
| Annual Report for the period ended March 31, 2003 [amend] |
| 03/11/2004 |
10-K
| Annual Report for the period ended December 31, 2003 |
| 11/19/2003 |
10-K/A
| Annual Report for the period ended December 31, 2002 [amend] |
| 04/30/2003 |
10-K/A
| Annual Report for the period ended December 31, 2002 [amend] |
| 03/27/2003 |
10-K
| Annual Report for the period ended December 31, 2002 |
| 04/29/2002 |
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 |
| 12/31/2001 |
10-K/A
| Annual Report for the period ended December 31, 2000 [amend] |
| 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 |
| 05/01/2000 |
10-K/A
| Annual Report for the period ended December 31, 1999 [amend] |
| 03/28/2000 |
10-K
| Annual Report for the period ended December 31, 1999 |
| 04/30/1999 |
10-K/A
| Annual Report for the period ended December 31, 1998 [amend] |
| 03/31/1999 |
10-K
| Annual Report for the period ended December 31, 1998 |
| 03/31/1998 |
10-K
| Annual Report for the period ended December 31, 1997 |
| 03/18/1997 |
10-K
| Annual Report for the period ended December 31, 1996 |