In connection with the change in status of Mr. Gary M. Halverson disclosed in an 8-K filing on May 11, 2015, on May 29, 2015, Mr. Halverson and the Company entered into the Letter Agreement on Employment and Termination of Benefits and Obligations (the "Agreement").  Under the Agreement, Mr. Halverson will continue his employment as Senior Vice President through May 31, 2016 and will continue to receive his current salary, be eligible for all health and welfare benefits and remain a participant in the Company's Management Incentive Compensation Plan during this period.  In addition, the stock options, performance restricted stock units and time-based restricted stock units previously awarded to Mr. Halverson will continue to vest pursuant to the terms of the underlying award agreements, as disclosed in the Company's 2015 Proxy Statement filed with the Securities and Exchange Commission on March 27, 2015, and Mr. Halverson's vested stock options will remain exercisable in accordance with the terms of the underlying award agreements.  Pursuant to the Agreement, Mr. Halverson has waived his ability to participate in the Company's Executive Severance Program.  The foregoing description of the Agreement is summary in nature and is qualified in its entirety by the text of the Agreement, which is attached hereto as Exhibit 10.1 and which is incorporated herein by reference.