Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 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):

	Three Months Ended
	March 31,
	2015			2014
Warranty liability balance, beginning of the period	$	2,600		$	3,328
Product warranty accruals	623			433
Utilization of accrual	(517		)	(683		)
Warranty liability balance, end of the period	$	2,706		$	3,078