Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 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):

	Three Months Ended
	March 31,
	2014			2013
Warranty liability balance, beginning of the period	$	3,328		$	3,954
Product warranty accruals	433			1,147
Utilization of accrual	(683		)	(1,212		)
Warranty liability balance, end of the period	$	3,078		$	3,889