Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2014

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,
	2014			2013
Warranty liability balance, beginning of the period	$	3,328		$	3,954
Product warranty accruals	1,843			2,295
Utilization of accrual	(2,480		)	(2,835		)
Warranty liability balance, end of the period	$	2,691		$	3,414