| Date Filed | Type | Description |
| 08/21/2012 |
8-K
| Submission of Matters to a Vote of Security Holders, Other Events, Financial Statements and Exhibits |
| 08/21/2012 |
8-K
| Resignation/termination of a director |
| 08/08/2012 |
8-K
| Quarterly results |
| 07/30/2012 |
8-K
| Form 8-K - Current report |
| 07/02/2012 |
8-K
| Regulation FD Disclosure, Financial Statements and Exhibits |
| 06/15/2012 |
8-K
| Quarterly results |
| 05/23/2012 |
8-K
| Acquisition/merger/asset purchase announced |
| 04/10/2012 |
8-K
| Form 8-K - Current report |
| 03/26/2012 |
8-K
| Regulation FD Disclosure, Financial Statements and Exhibits |
| 03/13/2012 |
8-K
| Regulation FD Disclosure, Financial Statements and Exhibits |
| 02/29/2012 |
8-K
| Regulation FD Disclosure, Financial Statements and Exhibits |
| 02/08/2012 |
8-K
| Results of Operations and Financial Condition, Financial Statements and Exhibits |
| 01/13/2012 |
8-K
| Form 8-K - Current report |
| 12/20/2011 |
8-K
| Other Events, Financial Statements and Exhibits |
| 12/12/2011 |
8-K
| Regulation FD Disclosure, Financial Statements and Exhibits |
| 12/08/2011 |
8-K
| Form 8-K - Current report |
| 11/23/2011 |
8-K
| Submission of Matters to a Vote of Security Holders |
| 11/21/2011 |
8-K
| Regulation FD Disclosure, Financial Statements and Exhibits |
| 11/18/2011 |
8-K
| Form 8-K - Current report |
| 11/16/2011 |
8-K
| Results of Operations and Financial Condition, Financial Statements and Exhibits |
| 11/10/2011 |
8-K
| Results of Operations and Financial Condition, Financial Statements and Exhibits |
| 11/07/2011 |
8-K
| Form 8-K - Current report |
| 10/17/2011 |
8-K
| Mine Safety - Reporting of Shutdowns and Patterns of Violations, Other Events, Financial Statements and Exhibits |
| 10/13/2011 |
8-K
| Results of Operations and Financial Condition, Financial Statements and Exhibits |
| 09/15/2011 |
8-K
| Results of Operations and Financial Condition, Financial Statements and Exhibits |
| 09/13/2011 |
8-K
| Regulation FD Disclosure, Financial Statements and Exhibits |
| 08/29/2011 |
8-K
| Other Events, Financial Statements and Exhibits |
| 08/25/2011 |
8-K
| Results of Operations and Financial Condition, Financial Statements and Exhibits |
| 08/22/2011 |
8-K
| Form 8-K - Current report |
| 08/19/2011 |
8-K
| Other Events, Financial Statements and Exhibits |
| 08/18/2011 |
8-K
| Results of Operations and Financial Condition, Financial Statements and Exhibits |
| 08/15/2011 |
8-K
| Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements... |
| 07/22/2011 |
8-K
| Entry into a Material Definitive Agreement |
| 07/21/2011 |
8-K
| Results of Operations and Financial Condition, Financial Statements and Exhibits |
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