Exhibit A
TRANSACTIONS BY REPORTING PERSONS IN LAST 60 DAYS
Beneficial Ownership |
| Purchase or |
| Quantity |
| Transaction |
| Price per Share |
| How Effected |
|
|
|
|
|
|
|
|
|
|
|
|
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 55,822 |
| 9/26/2011 |
| 26.01 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 2,941 |
| 9/26/2011 |
| 26.08 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 52,378 |
| 9/26/2011 |
| 26.01 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 2,759 |
| 9/26/2011 |
| 26.08 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 63,108 |
| 9/27/2011 |
| 27.02 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 59,215 |
| 9/27/2011 |
| 27.02 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 44,737 |
| 9/28/2011 |
| 26.68 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 41,977 |
| 9/28/2011 |
| 26.68 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 61,909 |
| 9/29/2011 |
| 26.85 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 24,741 |
| 9/29/2011 |
| 26.83 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 58,091 |
| 9/29/2011 |
| 26.85 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 23,214 |
| 9/29/2011 |
| 26.83 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 51,591 |
| 9/30/2011 |
| 26.84 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 48,409 |
| 9/30/2011 |
| 26.84 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 92,349 |
| 10/3/2011 |
| 26.49 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 60,408 |
| 10/3/2011 |
| 26.49 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 75,447 |
| 10/4/2011 |
| 26.19 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 49,353 |
| 10/4/2011 |
| 26.19 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 10,860 |
| 10/7/2011 |
| 27.51 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 7,103 |
| 10/7/2011 |
| 27.51 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 83,245 |
| 11/10/2011 |
| 27.53 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 42,858 |
| 11/10/2011 |
| 27.53 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 12,543 |
| 11/11/2011 |
| 27.71 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 6,457 |
| 11/11/2011 |
| 27.71 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 79,282 |
| 11/14/2011 |
| 27.20 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 44,726 |
| 11/14/2011 |
| 27.34 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 40,818 |
| 11/14/2011 |
| 27.20 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 23,027 |
| 11/14/2011 |
| 27.34 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 23,034 |
| 11/15/2011 |
| 27.90 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 11,859 |
| 11/15/2011 |
| 27.90 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 125,806 |
| 11/16/2011 |
| 28.74 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 39,188 |
| 11/16/2011 |
| 28.80 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 31,557 |
| 11/16/2011 |
| 28.77 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 64,772 |
| 11/16/2011 |
| 28.74 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 20,176 |
| 11/16/2011 |
| 28.80 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 16,247 |
| 11/16/2011 |
| 28.77 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 117,639 |
| 11/17/2011 |
| 29.02 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 36,681 |
| 11/17/2011 |
| 29.11 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 26,636 |
| 11/17/2011 |
| 29.24 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 60,567 |
| 11/17/2011 |
| 29.02 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 18,884 |
| 11/17/2011 |
| 29.11 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 13,713 |
| 11/17/2011 |
| 29.24 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 49,898 |
| 11/18/2011 |
| 29.53 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 25,690 |
| 11/18/2011 |
| 29.53 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 94,224 |
| 11/21/2011 |
| 29.15 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 33,007 |
| 11/21/2011 |
| 28.93 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 48,511 |
| 11/21/2011 |
| 29.15 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 16,993 |
| 11/21/2011 |
| 28.93 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 18,484 |
| 11/22/2011 |
| 29.66 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 43,990 |
| 11/22/2011 |
| 29.44 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 9,516 |
| 11/22/2011 |
| 29.66 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 22,648 |
| 11/22/2011 |
| 29.44 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 98,759 |
| 11/23/2011 |
| 29.45 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 50,847 |
| 11/23/2011 |
| 29.45 |
| Open Market |
|
Relational Investors Mid-Cap Fund I, L.P. |
| Purchase |
| 33,006 |
| 11/25/2011 |
| 29.17 |
| Open Market |
|
Relational Investors Mid-Cap Fund II, L.P. |
| Purchase |
| 16,994 |
| 11/25/2011 |
| 29.17 |
| Open Market |
|