GOODWILL AND INTANGIBLE ASSETS

Changes in goodwill consisted of the following (amounts in thousands):



	2013									2012
				Earthmoving/									Earthmoving/
	Agricultural			Construction						Agricultural			Construction
	Segment			Segment			Total			Segment			Segment		Total
Goodwill balance, January 1	$	11,522		$	13,419		$	24,941		$	19,841		$	—	$	19,841
Acquisition adjustment	—			—			—			(7,289		)	—		(7,289		)
Foreign currency translation	(993		)	(1,605		)	(2,598		)	(904		)	—		(904		)
Goodwill balance, June 30	$	10,529		$	11,814		$	22,343		$	11,648		$	—	$	11,648

The Company's agricultural segment goodwill balance is related to the acquisition of Goodyear's Latin American farm tire business which included the Sao Paulo, Brazil manufacturing facility. The Company's earthmoving/construction goodwill balance is related to the acquisition of Planet Group in August 2012. The Company reviews goodwill for impairment during the fourth quarter of each annual reporting period, and whenever events and circumstances indicate that the carrying values may not be recoverable. The Company's consumer segment does not have any recorded goodwill.

The components of intangible assets consisted of the following (amounts in thousands):



	Weighted- Average Useful Lives (in Years)	June 30, 2013		December 31, 2012
Amortizable intangible assets:
Customer relationships	14.0	17,125		19,357
Patents, trademarks and other	2.2	3,297		3,658
Total at cost		20,422		23,015
Less accumulated amortization		(2,777	)	(1,807	)
		17,645		21,208

Amortization related to intangible assets for the six months ended June 30, 2013 and 2012, totaled $1.2 million and $0.1 million, respectively. Intangible assets are included as a component of other assets in the consolidated condensed balance sheet.

The estimated aggregate amortization expense at June 30, 2013, is as follows (amounts in thousands):



July 1 - December 31, 2013	$	1,053
2014	2,103
2015	1,732
2016	1,158
2017	1,096
Thereafter	10,503
	$	17,645