Exhibit A

Transactions by Reporting Persons in the last 60 days not previously reported.

Beneficial Ownership	Purchase or Sale	Quantity	Transaction Date	Price per Share (including commission)		How Effected
Relational Investors LLC	Sale	65,303	7/14/2015	$	1.63	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	497,407	7/14/2015	$	1.63	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	604,253	7/14/2015	$	1.63	Open Market
Relational Investors LLC	Sale	304,799	7/14/2015	$	1.63	Open Market
Relational Coast Partners, L.P.	Sale	53,993	7/14/2015	$	1.63	Open Market
Relational Fund Partners, L.P.	Sale	5,016	7/14/2015	$	1.63	Open Market
RH Fund 1, L.P.	Sale	48,295	7/14/2015	$	1.63	Open Market
Relational Investors XV, L.P.	Sale	56,613	7/14/2015	$	1.63	Open Market
Relational Investors XVI, L.P.	Sale	25,783	7/14/2015	$	1.63	Open Market
Relational Investors XX, L.P.	Sale	52,039	7/14/2015	$	1.63	Open Market
Relational Investors XXIII, L.P.	Sale	72,822	7/14/2015	$	1.63	Open Market
Relational Investors IX, L.P.	Sale	61,410	7/14/2015	$	1.63	Open Market
Relational Investors LLC	Sale	173,754	7/14/2015	$	1.63	Open Market
Relational Investors XXIV, L.P.	Sale	8,888	7/14/2015	$	1.63	Open Market
Relational Investors LLC	Sale	29,474	7/15/2015	$	1.48	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	224,504	7/15/2015	$	1.48	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	272,732	7/15/2015	$	1.48	Open Market
Relational Investors LLC	Sale	137,570	7/15/2015	$	1.48	Open Market
Relational Coast Partners, L.P.	Sale	24,369	7/15/2015	$	1.48	Open Market
Relational Fund Partners, L.P.	Sale	2,264	7/15/2015	$	1.48	Open Market
RH Fund 1, L.P.	Sale	21,798	7/15/2015	$	1.48	Open Market
Relational Investors XV, L.P.	Sale	25,552	7/15/2015	$	1.48	Open Market
Relational Investors XVI, L.P.	Sale	11,637	7/15/2015	$	1.48	Open Market
Relational Investors XX, L.P.	Sale	23,487	7/15/2015	$	1.48	Open Market
Relational Investors XXIII, L.P.	Sale	32,868	7/15/2015	$	1.48	Open Market
Relational Investors IX, L.P.	Sale	27,717	7/15/2015	$	1.48	Open Market
Relational Investors LLC	Sale	78,423	7/15/2015	$	1.48	Open Market
Relational Investors XXIV, L.P.	Sale	4,012	7/15/2015	$	1.48	Open Market
Relational Investors LLC	Sale	10,743	7/16/2015	$	1.35	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	81,829	7/16/2015	$	1.35	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	99,410	7/16/2015	$	1.35	Open Market
Relational Investors LLC	Sale	50,143	7/16/2015	$	1.35	Open Market
Relational Coast Partners, L.P.	Sale	8,882	7/16/2015	$	1.35	Open Market
Relational Fund Partners, L.P.	Sale	825	7/16/2015	$	1.35	Open Market
RH Fund 1, L.P.	Sale	7,945	7/16/2015	$	1.35	Open Market
Relational Investors XV, L.P.	Sale	9,313	7/16/2015	$	1.35	Open Market
Relational Investors XVI, L.P.	Sale	4,241	7/16/2015	$	1.35	Open Market
Relational Investors XX, L.P.	Sale	8,561	7/16/2015	$	1.35	Open Market
Relational Investors XXIII, L.P.	Sale	11,980	7/16/2015	$	1.35	Open Market
Relational Investors IX, L.P.	Sale	10,102	7/16/2015	$	1.35	Open Market
Relational Investors LLC	Sale	28,584	7/16/2015	$	1.35	Open Market
Relational Investors XXIV, L.P.	Sale	1,462	7/16/2015	$	1.35	Open Market
Relational Investors LLC	Sale	44,338	7/17/2015	$	1.24	Open Market
Relational Investors Mid-Cap Fund I, L.P.	Sale	337,713	7/17/2015	$	1.24	Open Market
Relational Investors Mid-Cap Fund II, L.P.	Sale	410,253	7/17/2015	$	1.24	Open Market
Relational Investors LLC	Sale	206,942	7/17/2015	$	1.24	Open Market
Relational Coast Partners, L.P.	Sale	36,659	7/17/2015	$	1.24	Open Market
Relational Fund Partners, L.P.	Sale	3,406	7/17/2015	$	1.24	Open Market
RH Fund 1, L.P.	Sale	32,790	7/17/2015	$	1.24	Open Market
Relational Investors XV, L.P.	Sale	38,437	7/17/2015	$	1.24	Open Market
Relational Investors XVI, L.P.	Sale	17,506	7/17/2015	$	1.24	Open Market
Relational Investors XX, L.P.	Sale	35,332	7/17/2015	$	1.24	Open Market
Relational Investors XXIII, L.P.	Sale	49,443	7/17/2015	$	1.24	Open Market
Relational Investors IX, L.P.	Sale	41,694	7/17/2015	$	1.24	Open Market
Relational Investors LLC	Sale	117,970	7/17/2015	$	1.24	Open Market
Relational Investors XXIV, L.P.	Sale	6,035	7/17/2015	$	1.24	Open Market