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Leases
12 Months Ended
Dec. 31, 2013
Leases [Abstract]  
Leases
 Leases
The Company operates certain administrative, manufacturing, warehouse and testing facilities and equipment under lease arrangements that are accounted for as operating leases. Total rental expense was $12.5 million, $13.5 million and $11.6 million for 2013, 2012 and 2011, respectively.
Future minimum operating lease payments at December 31, 2013 were as follows (in thousands): 
2014
 
$
10,866

2015
 
9,943

2016
 
7,478

2017
 
5,479

2018
 
4,998

After 2018
 
19,790

Total operating lease payments
 
$
58,554