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Fair Value (Tables)
 12 Months Ended
Dec. 31, 2014
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Nonrecurring [Table Text Block]
The following table summarizes the Company's assets measured at fair value on a non-recurring basis relating to a goodwill impairment charge recognized during 2014 for the full carrying value of goodwill in the APC technology segment, as more fully described in Note 1.
 
Level 1
Level 2
Level 3
Impairment Losses
Fair Value at December 31, 2014
Goodwill
$
—

$
—

$
23,400

$
(23,400
)
$
—

 
$
—

$
—

$
23,400

$
(23,400
)
$
—