Exhibit A

JOINT FILING STATEMENT

The undersigned hereby agree that the Statement on Schedule 13G filed herewith (and any amendments thereto), is being filed jointly with the Securities and Exchange Commission pursuant to Rule 13d-1(k) (1) under the Securities Exchange Act of 1934, as amended, on behalf of each such person.

Dated: December 12, 2006


CROSSROADS 1999 SERIES DIRECT CO-INVESTMENT PORTFOLIO A, L.P.

By:		Crossroads Corporate Investors II, L.P.
		the general partner


By:		Crossroads Corporate Investors II GP, L.L.C.,
		the general partner


By:		/s/ Brad K. Heppner
		Brad K. Heppner, Manager


CROSSROADS CORPORATE INVESTORS II, L.P.

By:		Crossroads Corporate Investors II GP, L.L.C.,
		the general partner


By:		/s/ Brad K. Heppner
		Brad K. Heppner, Manager


CROSSROADS CORPORATE INVESTORS II GP, L.L.C.

By:		/s/ Brad K. Heppner
		Brad K. Heppner, Manager


LEHMAN BROTHERS HOLDINGS INC

By:		/s/ Barrett S. DiPaolo
		Barrett S. DiPaolo, Vice President


LEHMAN BROTHERS PRIVATE FUNDS INVESTMENT COMPANY GP, LLC

By:		/s/ Scott Christiansen
		Scott Christiansen, Vice President

BRADLEY K. HEPPNER

/s/ Bradley K. Heppner
Bradley K. Heppner

CROSSROADS CORNERSTONE DIRECT/CO-INVESTMENT FUND V, L.P.

By:		Lehman Crossroads Corporate Investors, LP the general partner


By:		Lehman Crossroads Corporate Investors GP, LLC, the general partner


By:		/s/ Scott Christiansen
		Scott Christiansen, Vice President


CROSSROADS CORPORATE INVESTORS, L.P.

By:		Lehman Crossroads Corporate Investors GP, LLC,
		the general partner


By:		/s/ Scott Christiansen
		Scott Christiansen, Vice President


CROSSROADS CORPORATE INVESTORS GP, LLC

By:		/s/ Scott Christiansen
		Scott Christiansen, Vice President

ORION HEALTHCORP INC SC 13G