Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2015

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):

	Six Months Ended
	June 30,
	2015			2014
Warranty liability balance, beginning of the period	$	2,600		$	3,328
Product warranty accruals	1,120			1,219
Utilization of accrual	(1,140		)	(1,604		)
Warranty liability balance, end of the period	$	2,580		$	2,943