Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Allowance for doubtful accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning of Period	$ 26,036		$ 29,040		$ 24,740
Charged To Cost And Expenses	3,684		2,934		10,481
Additions (Deductions) Describe	(5,966)	[1]	(5,938)	[1]	(6,181)	[1]
Balance At End of Period	23,754		26,036		29,040
Inventory obsolescense reserve [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning of Period	13,085		13,642		13,267
Charged To Cost And Expenses	5,310		3,708		3,367
Additions (Deductions) Describe	(3,260)	[2]	(4,265)	[2]	(2,992)	[2]
Balance At End of Period	15,135		13,085		13,642
Tax valuation allowances [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning of Period	100,314		88,170		79,499
Charged To Cost And Expenses	1,078		27,362		37
Additions (Deductions) Describe	19,078	[3]	(15,218)	[3]	8,634	[3]
Balance At End of Period	120,470		100,314		88,170
Accrued warranty cost [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning of Period	21,451		19,842		18,252
Charged To Cost And Expenses	19,394		14,611		13,658
Additions (Deductions) Describe	(13,452)	[2]	(13,002)	[2]	(12,068)	[2]
Balance At End of Period	27,393		21,451		19,842
Accrued product liability [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning of Period	20,334		21,748		24,160
Charged To Cost And Expenses	7,039		7,382		8,917
Additions (Deductions) Describe	(7,005)	[4]	(8,796)	[4]	(11,329)	[4]
Balance At End of Period	$ 20,368		$ 20,334		$ 21,748

[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.