Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2014

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,
	2014			2013
Warranty liability balance, beginning of the period	$	3,328		$	3,954
Product warranty accruals	1,219			1,899
Utilization of accrual	(1,604		)	(2,183		)
Warranty liability balance, end of the period	$	2,943		$	3,670