| Date Filed | Type | Description |
| 04/30/2012 |
10-K/A
| Annual Report for the period ended December 31, 2011 [amend] |
| 03/14/2012 |
10-K
| Annual Report for the period ended December 31, 2011 |
| 03/15/2011 |
10-K
| Annual Report for the period ended December 31, 2010 |
| 03/15/2010 |
10-K
| Annual Report for the period ended December 31, 2009 |
| 03/12/2009 |
10-K
| Annual Report for the period ended December 31, 2008 |
| 03/11/2008 |
10-K
| Annual Report for the period ended December 31, 2007 |
| 03/11/2008 |
AR
| 2007 Annual Report |
| 03/30/2007 |
10-K/A
| Annual Report for the period ended December 31, 2006 [amend] |
| 03/15/2007 |
10-K
| Annual Report for the period ended December 31, 2006 |
| 03/15/2007 |
AR
| 2006 Annual Report |
| 01/19/2007 |
10-K/A
| Annual Report for the period ended December 31, 2005 [amend] |
| 03/31/2006 |
10-K
| Annual Report for the period ended December 31, 2005 |
| 04/12/2005 |
10-K/A
| Annual Report for the period ended December 31, 2004 [amend] |
| 03/15/2005 |
10-K
| Annual Report for the period ended December 31, 2004 |
| 01/06/2005 |
10-K/A
| Annual Report for the period ended December 31, 2003 [amend] |
| 03/10/2004 |
10-K
| Annual Report for the period ended December 31, 2003 |
| 03/28/2003 |
10-K/A
| Annual Report for the period ended December 31, 2002 [amend] |
| 03/19/2003 |
10-K
| Annual Report for the period ended December 31, 2002 |
| 03/12/2002 |
10-K
| Annual Report for the period ended December 31, 2001 |
| 03/12/2001 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 03/10/2000 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 03/29/1999 |
10-K
| Annual Report for the period ended December 31, 1998 |
| 03/30/1998 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 03/28/1997 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 03/27/1996 |
10-K
| Annual Report for the period ended December 31, 1995 |
| 03/27/1995 |
10-K
| Annual Report for the period ended December 31, 1994 |
| 03/29/1994 |
10-K
| Annual Report for the period ended December 31, 1993 |