9. Goodwill

Goodwill is assigned to reporting units based upon the specific region where the assets are acquired and associated goodwill resided.

The following table reflects the changes in the carrying amounts of goodwill by reportable segment for the three months ended March 31, 2013 (unaudited):

	Region One			Region Two			Region Three			Region Four			Region Five			Total
Balance as of December 31, 2012	$	191,941		$	31,840		$	65,770		$	62,052		$	83,519		$	435,122
Contingent payments related to acquisitions							(6		)							(6		)
Adjustment to purchase price allocation (1)	(272		)	(61		)	(61		)	(85		)	(172		)	(651		)
Foreign currency translation				(122		)										(122		)
Balance as of March 31, 2013	$	191,669		$	31,657		$	65,703		$	61,967		$	83,347		$	434,343

(1) Primarily related to fair value adjustments on accounts receivable.