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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2016
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,
 
2016

2015

2014
Balance, beginning of the year
$
1,894


$
1,574


$
1,551

Accruals
2,405


2,640


2,048

Usage
(2,511
)

(2,320
)

(2,025
)
Balance, end of the year
$
1,788


$
1,894


$
1,574