Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 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):

	Six Months Ended
	June 30,
	2016			2015
Warranty liability balance, beginning of the period	$	2,553		$	2,600
Product warranty accruals	754			1,120
Utilization of accrual	(1,146		)	(1,140		)
Warranty liability balance, end of the period	$	2,161		$	2,580