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	—		—		—		(10,134		)	—		(10,134		)
Foreign currency translation	105		55		160		585			—		585
Goodwill balance, March 31	$	11,627	$	13,474	$	25,101	$	10,292		$	—	$	10,292

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)	March 31, 2013		December 31, 2012
Amortizable intangible assets:
Customer relationships	14.2	19,430		19,357
Patents, trademarks and other	2.4	3,670		3,658
Total at cost		23,100		23,015
Less accumulated amortization		(2,416	)	(1,807	)
		20,684		21,208

Amortization related to intangible assets for the three months ended March 31, 2013 and 2012, totaled $0.6 million and $0.0 million, respectively. Intangible assets are included as a component of other assets in the consolidated condensed balance sheet.

The estimated aggregate amortization expense at March 31, 2013, is as follows (amounts in thousands):



April 1 - December 31, 2013	$	1,804
2014	2,381
2015	1,960
2016	1,312
2017	1,250
Thereafter	11,977
	$	20,684