Goodwill and Other Intangible Assets (Details) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Goodwill by reportable segment [Roll Forward]
Balance as of December 31, 2012	$ 100,697,000
Balance as of June 30, 2013	100,697,000
Other intangible assets by reportable segment [Roll Forward]
Beginning Balance	134,180,000	181,349,000
Amortization	(4,535,000)	(5,391,000)
Ending Balance	129,645,000	175,958,000
Goodwill [Abstract]
Gross Amount	100,697,000		100,697,000
Accumulated Amortization	0		0
Carrying Amount	100,697,000
Other intangible assets [Abstract]
Gross Amount	194,694,000		194,694,000
Accumulated Amortization	65,049,000		60,514,000
Carrying Amount	129,645,000	175,958,000
Estimated amortization expense for other intangible assets, 2013	8,700,000
Estimated amortization expense for other intangible assets, 2014	8,100,000
Estimated amortization expense for other intangible assets, 2015	8,100,000
Estimated amortization expense for other intangible assets, 2016	8,100,000
Estimated amortization expense for other intangible assets, 2017	8,100,000
Non-compete agreements [Member]
Other intangible assets by reportable segment [Roll Forward]
Beginning Balance	679,000
Ending Balance	179,000
Other intangible assets [Abstract]
Weighted Average Useful Lives	2 years
Gross Amount	1,552,000		1,552,000
Accumulated Amortization	1,373,000		873,000
Carrying Amount	179,000
Trade names [Member]
Other intangible assets by reportable segment [Roll Forward]
Beginning Balance			25,200,000
Ending Balance	25,200,000		25,200,000
Other intangible assets [Abstract]
Gross Amount	25,200,000		25,200,000
Accumulated Amortization	0		0
Carrying Amount	25,200,000		25,200,000
Technology [Member]
Other intangible assets by reportable segment [Roll Forward]
Beginning Balance	21,302,000
Ending Balance	19,826,000
Other intangible assets [Abstract]
Weighted Average Useful Lives	10 years
Gross Amount	38,849,000		38,849,000
Accumulated Amortization	19,023,000		17,547,000
Carrying Amount	19,826,000
Customer relationships [Member]
Other intangible assets by reportable segment [Roll Forward]
Beginning Balance	86,999,000
Ending Balance	84,440,000
Other intangible assets [Abstract]
Weighted Average Useful Lives	19 years 10 months 24 days
Gross Amount	129,093,000		129,093,000
Accumulated Amortization	44,653,000		42,094,000
Carrying Amount	84,440,000
Wheels [Member]
Goodwill by reportable segment [Roll Forward]
Balance as of December 31, 2012	96,283,000
Balance as of June 30, 2013	96,283,000
Other intangible assets by reportable segment [Roll Forward]
Beginning Balance	130,668,000	138,575,000
Amortization	(3,952,000)	(3,953,000)
Ending Balance	126,716,000	134,622,000
Goodwill [Abstract]
Carrying Amount	96,283,000
Other intangible assets [Abstract]
Carrying Amount	126,716,000	134,622,000
Gunite [Member]
Other intangible assets by reportable segment [Roll Forward]
Beginning Balance		38,968,000
Amortization		(1,100,000)
Ending Balance		37,868,000
Other intangible assets [Abstract]
Carrying Amount		37,868,000
Brillion Iron Works [Member]
Goodwill by reportable segment [Roll Forward]
Balance as of December 31, 2012	4,414,000
Balance as of June 30, 2013	4,414,000
Other intangible assets by reportable segment [Roll Forward]
Beginning Balance	2,833,000	2,997,000
Amortization	(83,000)	(82,000)
Ending Balance	2,750,000	2,915,000
Goodwill [Abstract]
Carrying Amount	4,414,000
Other intangible assets [Abstract]
Carrying Amount	2,750,000	2,915,000
Corporate [Member]
Other intangible assets by reportable segment [Roll Forward]
Beginning Balance	679,000	809,000
Amortization	(500,000)	(256,000)
Ending Balance	179,000	553,000
Other intangible assets [Abstract]
Carrying Amount	$ 179,000	$ 553,000