Exhibit A

TRANSACTIONS BY REPORTING PERSONS IN LAST 60 DAYS

Beneficial Ownership	Purchase or Sale	Quantity	Transaction Date	Price per Share (including commission)	How Effected
Relational Investors Mid-Cap Fund I, L.P.	Sale	820,672	7/16/2012	50.01	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	293,439	7/16/2012	50.07	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	473,694	7/16/2012	50.01	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	169,373	7/16/2012	50.07	Open Market
Relational Investors LLC	Sale	104,006	7/16/2012	50.01	Open Market
Relational Investors LLC	Sale	37,188	7/16/2012	50.07	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	154,396	7/17/2012	50.15	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	117,376	7/17/2012	50.12	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	162,820	7/17/2012	50.04	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	89,117	7/17/2012	50.15	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	67,749	7/17/2012	50.12	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	93,980	7/17/2012	50.04	Open Market
Relational Investors LLC	Sale	19,567	7/17/2012	50.15	Open Market
Relational Investors LLC	Sale	14,875	7/17/2012	50.12	Open Market
Relational Investors LLC	Sale	20,634	7/17/2012	50.04	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	228,294	7/18/2012	50.05	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	213,202	7/18/2012	50.06	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	58,689	7/18/2012	50.08	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	131,773	7/18/2012	50.05	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	123,061	7/18/2012	50.06	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	33,874	7/18/2012	50.08	Open Market
Relational Investors LLC	Sale	28,933	7/18/2012	50.05	Open Market
Relational Investors LLC	Sale	27,020	7/18/2012	50.06	Open Market
Relational Investors LLC	Sale	7,437	7/18/2012	50.08	Open Market