Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2014

Goodwill and Other Intangible Assets [Abstract]

Carrying amount of goodwill on a reportable segment basis

The following represents the carrying amount of goodwill, on a reportable segment basis, as of December 31, 2013 and March 31, 2014:

	Wheels		Brillion Iron Works		Total
Balance as of December 31, 2013	$	96,283	$	4,414	$	100,697
Balance as of March 31, 2014	$	96,283	$	4,414	$	100,697

Carrying amount of other intangible assets by reportable segment

The changes in the carrying amount of other intangible assets for the period December 31, 2013 to March 31, 2014, by reportable segment, are as follows:

	Wheels			Brillion Iron Works			Total
Balance as of December 31, 2013	$	122,764		$	2,666		$	125,430
Amortization		(1,977	)		(42	)		(2,019	)
Balance as of March 31, 2014	$	120,787		$	2,624		$	123,411

The changes in the carrying amount of other intangible assets for the period December 31, 2012 to March 31, 2013, by reportable segment, are as follows:

	Wheels			Brillion Iron Works			Corporate			Total
Balance as of December 31, 2012	$	130,668		$	2,833		$	679		$	134,180
Amortization		(1,975	)		(41	)		(257	)		(2,273	)
Balance as of March 31, 2013	$	128,693		$	2,792		$	422		$	131,907

Summary of goodwill and other intangible assets

The summary of goodwill and other intangible assets is as follows:

			As of March 31, 2014						As of December 31, 2013
	Weighted Average Useful Lives		Gross Amount		Accumulated Amortization		Carrying Amount		Gross Amount		Accumulated Amortization		Carrying Amount
Goodwill		—	$	100,697	$	—	$	100,697	$	100,697	$	—	$	100,697
Other intangible assets:
Trade names		—	$	25,200	$	—	$	25,200	$	25,200	$	—	$	25,200
Technology		10.0		38,849		21,233		17,616		38,849		20,497		18,352
Customer relationships		19.9		129,093		48,498		80,595		129,093		47,215		81,878
Other intangible assets:			$	194,694	$	71,283	$	123,411	$	194,694	$	69,264	$	125,430