Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2013

Commitments and Contingencies Disclosure [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

The following is a summary of the change in the Company's warranty accrual reserve (in thousands):

	Nine Months Ended
	September 30,
	2013			2012
Warranty liability balance, beginning of the period	$	3,954		$	3,438
Product warranty accruals	2,295			3,209
Utilization of accrual	(2,835		)	(3,529		)
Warranty liability balance, end of the period	$	3,414		$	3,118