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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2014
Commitments and Contingencies [Abstract]  
Schedule of Product Warranty Liability [Table Text Block]
Changes in the Company’s warranty reserves are as follows:
 
Year Ended December 31,
 
2012

2013

2014
Balance, beginning of the year
$
1,406


$
2,024


$
1,551

Accruals
2,482


1,956


2,048

Warranty liability assumed in acquisition
225


—


—

Usage
(2,089
)

(2,429
)

(2,025
)
Balance, end of the year
$
2,024


$
1,551


$
1,574