Commitments and Contingencies - (Tables)

6 Months Ended

Jun. 30, 2014

Commitments and Contingencies [Abstract]

Schedule of changes product warranty liability [Table Text Block]

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

	Six Months Ended June 30,
	2014		2013
Balance, beginning of the period	$	1,551	$	2,024
Accruals	961		1,033
Less: Usage	1,035		1,365
Balance, end of the period	$	1,477	$	1,692