Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 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):

	Three Months Ended
	March 31,
	2013			2012
Warranty liability balance, beginning of the period	$	3,954		$	3,438
Product warranty accruals	1,147			808
Utilization of accrual	(1,212		)	(1,182		)
Warranty liability balance, end of the period	$	3,889		$	3,064