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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Nonrecurring
The following table summarizes the Company's assets measured at fair value on a non-recurring basis relating to an intangible assets impairment charge recognized during 2015 primarily related to the customer lists acquired in the 2009 acquisition of Advanced Combustion Technology and the 2014 acquisition of PECO 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, 2015
Other intangible assets, net
$
—

$
—

$
8,569

$
(1,425
)
$
7,144

 
$
—

$
—

$
8,569

$
(1,425
)
$
7,144

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
)
$
—