Warrany Costs (Tables)

6 Months Ended

Jun. 30, 2012

Accrued Liabilities, Current [Abstract]

Accrued Warranty Costs [Table Text Block]

Balance as of January 1, 2012	$	19,842
Warranties provided during the period	6,147
Settlements made during the period	(6,917		)
Changes in liability for pre-existing warranties during the period, including expirations	1,786
Balance as of June 30, 2012	$	20,858