Schedule II - Valuation and Qualifying Accounts - (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Allowance for doubtful accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning of Period	$ 23,754		$ 26,036		$ 29,040
Charged To Cost And Expenses	1,765		3,684		2,934
Additions (Deductions) Describe	(6,679)	[1]	(5,966)	[1]	(5,938)	[1]
Balance At End of Period	18,840		23,754		26,036
Inventory obsolescense reserve [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning of Period	15,135		13,085		13,642
Charged To Cost And Expenses	5,993		5,310		3,708
Additions (Deductions) Describe	(3,511)	[2]	(3,260)	[2]	(4,265)	[2]
Balance At End of Period	17,617		15,135		13,085
Tax valuation allowances [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning of Period	117,790		97,406		85,122
Charged To Cost And Expenses	33,195		1,078		27,362
Additions (Deductions) Describe	(17,073)	[3]	19,306	[3]	(15,078)	[3]
Balance At End of Period	133,912		117,790		97,406
Accrued warranty cost [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning of Period	27,393		21,451		19,842
Charged To Cost And Expenses	26,097		19,394		14,611
Additions (Deductions) Describe	(22,752)	[2]	(13,452)	[2]	(13,002)	[2]
Balance At End of Period	30,738		27,393		21,451
Accrued product liability [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning of Period	20,368		20,334		21,748
Charged To Cost And Expenses	5,910		7,039		7,382
Additions (Deductions) Describe	(3,084)	[4]	(7,005)	[4]	(8,796)	[4]
Balance At End of Period	$ 23,194		$ 20,368		$ 20,334

[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.