Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Disclosure Accrued Expenses [Abstract]
Advanced customer deposits	$ 33,622	$ 33,246
Accrued payroll and related expenses	31,609	41,434
Accrued warranty	15,474	13,842
Accrued customer rebates	13,812	23,136
Accrued product liability and workers compensation	11,970	10,771
Accrued agent commission	8,607	8,668
Accrued professional services	7,316	7,497
Other accrued expenses	24,890	31,798
Accrued expenses	$ 147,300	$ 170,392