Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Common Stock^F1	Sep 10, 2018	S	2,500	$50.50	D	218,832	D
Common Stock^F2,F1	Sep 10, 2018	S	20,000	$51.30	D	198,832	D
Common Stock^F3	holding	—	—		—	1,640,493	D
Common Stock^F4	holding	—	—		—	412,719	D
Common Stock^F5	holding	—	—		—	160,000	I	BY WIFE
Common Stock^F6	holding	—	—		—	320,111	D
Common Stock^F7	holding	—	—		—	19,000	I	BY KOSKI MANAGEMENT, INC.
Common Stock^F8	holding	—	—		—	70,000	D

Table II — derivative securities

No Table II lines on this filing.

Explanation of responses

F1Shares owned directly by Christine L. Koski.
F2The range of prices for the transactions reported is $51.00 - $51.60. The undersigned hereby undertakes to provide upon request by the Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.
F3Shares owned directly by Koski Family Limited Partnership. Shares owned indirectly by Beverly Koski, Christine L. Koski, Robert C. Koski and Thomas L. Koski, each of whom is a general partner of the partnership or the controlling person of a corporate general partner of the partnership.
F4Shares owned directly by Thomas L. Koski.
F5Shares owned indirectly by Thomas L. Koski.
F6Shares owned directly by Beverly Koski.
F7Shares owned indirectly by Beverly Koski.
F8Shares owned directly by Robert C. Koski.