Goodwill and Other Intangible Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill by reportable segment [Abstract]
Goodwill	$ 100,697,000	$ 100,697,000	$ 100,697,000
Impairment of goodwill	0	0	62,839,000
Impairment of customer relationships and technology			36,800,000
Other intangible assets by reportable segment [Roll Forward]
Beginning Balance	125,430,000	134,180,000
Additions	671,000	0
Amortization	(8,138,000)	(8,750,000)	(10,981,000)
Ending Balance	117,963,000	125,430,000	134,180,000
Goodwill [Abstract]
Gross Amount	100,697,000	100,697,000
Accumulated Amortization	0	0
Carrying Amount	100,697,000	100,697,000	100,697,000
Other intangible assets [Abstract]
Gross Amount	191,673,000	193,142,000
Accumulated Amortization	73,710,000	67,712,000
Carrying Amount	117,963,000	125,430,000	134,180,000
Amortization expense, Maturity [Abstract]
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
Estimated amortization expense for other intangible assets, 2018	8,100,000
Estimated amortization expense for other intangible assets, 2019	8,100,000
Trade names [Member]
Other intangible assets by reportable segment [Roll Forward]
Beginning Balance	25,200,000
Ending Balance	25,200,000
Other intangible assets [Abstract]
Weighted Average Useful Lives	0 years
Gross Amount	25,200,000	25,200,000
Accumulated Amortization	0	0
Carrying Amount	25,200,000
Technology [Member]
Other intangible assets by reportable segment [Roll Forward]
Beginning Balance	18,352,000
Ending Balance	16,011,000
Other intangible assets [Abstract]
Weighted Average Useful Lives	10 years
Gross Amount	39,169,000	38,849,000
Accumulated Amortization	23,158,000	20,497,000
Carrying Amount	16,011,000
Customer relationships [Member]
Other intangible assets by reportable segment [Roll Forward]
Beginning Balance	81,878,000
Ending Balance	76,752,000
Other intangible assets [Abstract]
Weighted Average Useful Lives	19 years 10 months 24 days
Gross Amount	127,304,000	129,093,000
Accumulated Amortization	50,552,000	47,215,000
Carrying Amount	76,752,000
Wheels [Member]
Goodwill by reportable segment [Abstract]
Goodwill	96,283,000	96,283,000	96,283,000
Other intangible assets by reportable segment [Roll Forward]
Beginning Balance	122,764,000	130,668,000
Additions	671,000	0
Amortization	(7,970,000)	(7,904,000)
Ending Balance	115,465,000	122,764,000
Goodwill [Abstract]
Carrying Amount	96,283,000	96,283,000	96,283,000
Other intangible assets [Abstract]
Carrying Amount	115,465,000	122,764,000
Brillion Iron Works [Member]
Goodwill by reportable segment [Abstract]
Goodwill	4,414,000	4,414,000	4,414,000
Other intangible assets by reportable segment [Roll Forward]
Beginning Balance	2,666,000	2,833,000
Additions	0	0
Amortization	(168,000)	(167,000)
Ending Balance	2,498,000	2,666,000
Goodwill [Abstract]
Carrying Amount	4,414,000	4,414,000	4,414,000
Other intangible assets [Abstract]
Carrying Amount	2,498,000	2,666,000
Corporate / Other [Member]
Other intangible assets by reportable segment [Roll Forward]
Beginning Balance	0	679,000
Additions	0	0
Amortization	0	(679,000)
Ending Balance	0	0
Other intangible assets [Abstract]
Carrying Amount	$ 0	$ 0