Note O. Goodwill

Goodwill is assigned to respective segments based upon the specific Region where the assets acquired and associated goodwill resided.

The following table reflects the changes in the carrying amounts of goodwill by reported segment for the years ended December 31, 2012 and 2011.

	Region One		Region Two		Region Three			Region Four		Region Five		Total

Balance as of December 31, 2010	$	65,396	$	3,760	$	37,176		$	22,577	$	3,286	$	132,196
Acquired during the period		73		—		—			—		—		73
Contingent payments related to acquisitions		228		—		34			—		—		262
Foreign currency translation		—		—		(114	)		—		—		(114	)

Balance as of December 31, 2011	$	65,697	$	3,760	$	37,097		$	22,577	$	3,286	$	132,417
Acquired during the period		125,965		28,080		28,483			39,475		80,233		302,236
Contingent payments related to acquisitions		279		—		53			—		—		332
Foreign currency translation		—		—		137			—		—		137

Balance as of December 31, 2012	$	191,941	$	31,840	$	65,770		$	62,052	$	83,519	$	435,122