Exhibit 99.A

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.	Purchase	8,231	2/13/2009	$		12.00	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	8,231	2/13/2009	$		12.00	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	50,000	2/17/2009	$		11.45	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	50,000	2/17/2009	$		11.45	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	75,000	2/18/2009	$		10.77	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	75,000	2/18/2009	$		10.77	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	50,000	2/19/2009	$		10.45	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	50,000	2/19/2009	$		10.45	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	62,500	2/20/2009	$		10.39	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	62,500	2/20/2009	$		10.39	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	122,850	2/23/2009	$		10.50	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	122,850	2/23/2009	$		10.50	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	62,500	2/24/2009	$		10.67	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	62,500	2/24/2009	$		10.67	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	62,500	2/25/2009	$		10.65	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	62,500	2/25/2009	$		10.65	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	62,500	2/26/2009	$		10.70	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	62,500	2/26/2009	$		10.70	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	67,500	2/27/2009	$		10.61	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	67,500	2/27/2009	$		10.61	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	79,774	3/2/2009	$		10.47	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	79,774	3/2/2009	$		10.47	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	26,250	3/27/2009	$		14.35	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	26,250	3/27/2009	$		14.35	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	150,000	3/30/2009	$		13.12	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	150,000	3/30/2009	$		13.12	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	125,000	3/31/2009	$		13.54	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	125,000	3/31/2009	$		13.54	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	100,000	4/1/2009	$		13.97	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	100,000	4/1/2009	$		13.97	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	66,000	4/2/2009	$	15.42		Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	66,000	4/2/2009	$	15.42		Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	40,900	4/3/2009	$	15.10		Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	40,900	4/3/2009	$	15.10		Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	112,000	4/6/2009	$	15.02		Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	112,000	4/6/2009	$	15.02		Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	169,795	4/7/2009	$	14.74		Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	169,795	4/7/2009	$	14.74		Open Market
Relational Investors Mid-Cap Fund I, L.P.	Purchase	125,000	4/8/2009	$		15.38	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Purchase	125,000	4/8/2009	$		15.38	Open Market