Commitments and Contingencies - (Tables)

3 Months Ended

Mar. 31, 2017

Commitments and Contingencies [Abstract]

Schedule of changes product warranty liability [Table Text Block]

Changes in the Company’s warranty reserves are as follows:

	Three Months Ended March 31,
	2017			2016
Balance, beginning of the period	$	1,788		$	1,894
Accruals	855			544
Usage	(648		)	(665		)
Balance, end of the period	$	1,995		$	1,773