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Goodwill Goodwill (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2014 are as follows (in thousands):
 
 
Instruments
 
OEM and Emerging Markets
 
Security
 
Maritime
 
Surveillance
 
Detection
 
Total
Balance, January 1, 2014
$
163,995

 
$
92,166

 
$
48,199

 
$
114,419

 
$
108,693

 
$
48,229

 
$
575,701

Currency translation adjustments
(832
)
 
(467
)
 
(244
)
 
1,553

 
(223
)
 
34

 
(179
)
Balance, June 30, 2014
$
163,163

 
$
91,699

 
$
47,955

 
$
115,972

 
$
108,470

 
$
48,263

 
$
575,522