Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) (USD $)	Dec. 31, 2012		Dec. 31, 2011
Deferred tax assets
Loss carryforwards(1)	$ 54,904,000	[1]	$ 61,330,000
Accrued expenses	32,998,000		27,103,000
Warranty reserves	16,712,000		21,230,000
Pension plan benefits expense	14,834,000		6,677,000
Equity compensation	10,501,000		10,526,000
Deferred Tax Assets, Depreciation and Amortization	9,632,000		9,241,000
Tax credits(2)	7,054,000	[2]	17,481,000
Inventory valuation	4,557,000		4,252,000
Other deferred tax assets, net	5,824,000		2,654,000
Total deferred tax assets	157,016,000		160,494,000
Valuation allowance	(29,560,000)		(29,953,000)
Total deferred tax assets, net of valuation allowance	127,456,000		130,541,000
Deferred tax liabilities
Deferred Tax Liabilities, Depreciation and Amortization	59,210,000		71,889,000
Tax effect of accumulated translation	(2,012,000)		(2,733,000)
Other deferred tax liabilities, net	(4,826,000)		(7,885,000)
Total deferred tax liabilities	66,048,000		82,507,000
Net deferred tax assets	61,408,000		48,034,000
Deferred Tax Assets, Tax Credit Carryforwards, Research and Development	18,100,000	[2]
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	2,500,000	[2]
Deferred Tax Assets, Tax Credit Carryforwards, General Business	5,200,000	[2]
U.S. federal
Deferred tax assets
Loss carryforwards(1)	$ 26,400,000	[1]

[1] For tax return purposes at December 31, 2012, we had U.S. federal loss carryforwards of $26.4 million that expire during the years 2021 through 2022. The remaining portion of the loss carryforwards are composed primarily of losses in various foreign jurisdictions. The majority of these losses can be carried forward indefinitely. At December 31, 2012, there was a valuation allowance of $29.6 million primarily associated with foreign loss carryforwards.

[2] For tax return purposes at December 31, 2012, we had: (1) federal and state research and development tax credits of $18.1 million, which begin to expire in 2020; (2) alternative minimum tax credits of $2.5 million that are carried forward indefinitely; and (3) general business tax credits of $5.2 million, which begin to expire in 2029.