Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Allowance for doubtful accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning of Period	$ 29,040		$ 24,740		$ 23,242
Charged To Cost And Expenses	2,934		10,481		14,637
Additions (Deductions) Describe	(5,938)	[1]	(6,181)	[1]	(13,139)	[1]
Balance At End of Period	26,036		29,040		24,740
Inventory obsolescense reserve [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning of Period	13,642		13,267		13,257
Charged To Cost And Expenses	3,708		3,367		4,441
Additions (Deductions) Describe	(4,265)	[2]	(2,992)	[2]	(4,431)	[2]
Balance At End of Period	13,085		13,642		13,267
Tax valuation allowances [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning of Period	90,430		79,499		65,050
Charged To Cost And Expenses	27,362		37		4,526
Additions (Deductions) Describe	2,103	[3]	10,894	[3]	9,923	[3]
Balance At End of Period	119,895		90,430		79,499
Accrued warranty cost [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning of Period	19,842		18,252		21,506
Charged To Cost And Expenses	14,611		13,658		6,427
Additions (Deductions) Describe	(13,002)	[2]	(12,068)	[2]	(9,681)	[2]
Balance At End of Period	21,451		19,842		18,252
Accrued product liability [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning of Period	21,748		24,160		23,989
Charged To Cost And Expenses	7,382		8,917		8,523
Additions (Deductions) Describe	(8,796)	[4]	(11,329)	[4]	(8,352)	[4]
Balance At End of Period	$ 20,334		$ 21,748		$ 24,160

[1] Uncollectible accounts written off, net of recoveries.

[2] Amounts written off or payments incurred.

[3] Other activity not affecting federal or foreign tax expense.

[4] Loss and loss adjustment.