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Leases
12 Months Ended
Dec. 31, 2014
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 $12.0 million, $12.5 million and $13.5 million for 2014, 2013 and 2012, respectively.
Future minimum operating lease payments at December 31, 2014 were as follows (in thousands): 
2015
 
$
12,309

2016
 
9,342

2017
 
6,983

2018
 
5,535

2019
 
5,278

After 2019
 
15,955

Total operating lease payments
 
$
55,402