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Leases

12 Months Ended

Dec. 31, 2017

Rental expense amounted to $4.3 million, $4.1 million and $5.0 million for the years ended December 31, 2017, 2016 and 2015, respectively, and was incurred primarily for facility leases. Future annual minimum rental commitments as of December 31, 2017 are as follows (in thousands):



Fiscal Years
2018	$	3,824
2019	3,850
2020	3,099
2021	2,124
2022	2,202
Thereafter	4,033
Total	$	19,132