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Leases
12 Months Ended
Dec. 31, 2014
Leases [Abstract]  
Leases
Leases
Rental expense amounted to $5.6 million, $5.1 million and $3.7 million for the years ended December 31, 2014, 2013 and 2012, respectively, and was incurred primarily for facility leases. Future annual minimum rental commitments as of December 31, 2014 are as follows (in thousands):
Fiscal Years
 
2015
$
4,278

2016
4,307

2017
3,650

2018
2,273

2019
2,298

Thereafter
3,673

Total
$
20,479