Common use of Binding Agreement; Written Amendments Clause in Contracts

Binding Agreement; Written Amendments. This Agreement shall be binding upon the heirs, executors, administrators and successors of the parties. This Agreement constitutes the entire agreement between the parties with respect to the Performance Share Units, and supersedes any prior agreements or documents with respect to the Performance Share Units. No amendment or alteration of this Agreement which may impose any additional obligation upon the Company shall be valid unless expressed in a written instrument duly executed in the name of the Company, and no amendment, alteration, suspension or termination of this Agreement which may materially impair the rights of Employee with respect to the Performance Share Units shall be valid unless expressed in a written instrument executed by Employee.

Binding Agreement; Written Amendments. This Agreement shall be binding upon the heirs, executors, administrators and successors of the parties. This Agreement constitutes the entire agreement between the parties with respect to the Performance Share UnitsShares, and supersedes any prior agreements or documents with respect to the Performance Share UnitsShares. No amendment or alteration of this Agreement which may impose any additional obligation upon the Company shall be valid unless expressed in a written instrument duly executed in the name of the Company, and no amendment, alteration, suspension or termination of this Agreement which may materially impair the rights of Employee with respect to the Performance Share Units Shares shall be valid unless expressed in a written instrument executed by Employee.

Binding Agreement; Written Amendments. This Agreement shall be binding upon the heirs, executors, administrators and successors of the parties. This Agreement constitutes the entire agreement between the parties with respect to the Performance Share Units, and supersedes any prior agreements or documents with respect to the Performance Share Units. No amendment 40324862v2 or alteration of this Agreement which may impose any additional obligation upon the Company shall be valid unless expressed in a written instrument duly executed in the name of the Company, and no amendment, alteration, suspension or termination of this Agreement which may materially impair the rights of Employee with respect to the Performance Share Units shall be valid unless expressed in a written instrument executed by Employee.

Binding Agreement; Written Amendments. This Agreement shall be binding upon the heirs, executors, administrators and successors of the parties. This Agreement constitutes the entire agreement between the parties with respect to the Performance Share Units, and supersedes any prior agreements or documents with respect to the Performance Share Units. No amendment 40324875v2 or alteration of this Agreement which may impose any additional obligation upon the Company shall be valid unless expressed in a written instrument duly executed in the name of the Company, and no amendment, alteration, suspension or termination of this Agreement which may materially impair the rights of Employee with respect to the Performance Share Units shall be valid unless expressed in a written instrument executed by Employee.

Binding Agreement; Written Amendments. This Agreement shall be binding upon the heirs, executors, administrators and successors of the parties. This Agreement constitutes the entire agreement between the parties with respect to the Performance Share UnitsShares, and supersedes any prior agreements or documents with respect to the Performance Share UnitsShares. No amendment or alteration of this Agreement which may impose any additional obligation upon the Company shall be valid unless expressed in a written instrument duly executed in the name of the Company, and no amendment, alteration, suspension or termination of this Agreement which may materially impair the rights of Employee with respect to the Performance Share Units Shares shall be valid unless expressed in a written instrument executed by Employee.. Exhibit 10.21