Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2016

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,
	2016			2015
Warranty liability balance, beginning of the period	$	2,553		$	2,600
Product warranty accruals	385			623
Utilization of accrual	(603		)	(517		)
Warranty liability balance, end of the period	$	2,335		$	2,706