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Goodwill Goodwill (Tables)
 9 Months Ended
Sep. 30, 2014
Disclosure - Goodwill - Additional Information [Abstract]  
Carrying value of goodwill by reporting segment and the activity
The carrying value of goodwill by operating segment and the activity for the nine months ended September 30, 2014 are as follows (in thousands):
 
 
Surveillance
 
Instruments
 
OEM and Emerging Markets
 
Maritime
 
Security
 
Detection
 
Total
Balance, January 1, 2014
$
108,693

 
$
163,995

 
$
92,166

 
$
114,419

 
$
48,199

 
$
48,229

 
$
575,701

Currency translation adjustments
(852
)
 
(6,107
)
 
(3,389
)
 
(2,091
)
 
(1,795
)
 
(24
)
 
(14,258
)
Other activity
—

 
—

 
(955
)
 
—

 
—

 
—

 
(955
)
Balance, September 30, 2014
$
107,841

 
$
157,888

 
$
87,822

 
$
112,328

 
$
46,404

 
$
48,205

 
$
560,488