Commitments

Lease commitments

We lease our buildings under operating leases. Commitments under operating leases primarily relate to leasehold property and office equipment. Rent expense was $6.8 million, $6.9 million and $5.7 million for the years ended December 31, 2014, December 31, 2013 and December 31, 2012, respectively.

The minimum future payments on non-cancelable operating leases are as follows:



	December 31, 2014
	(In thousands)
2015	$	5,637
2016	5,590
2017	4,873
2018	4,711
2019	4,836
Thereafter	12,991
Total minimum future lease payments	$	38,638

Purchase obligations

We purchase components from a variety of suppliers and use contract manufacturers to provide manufacturing services for our products. During the normal course of business, we issue purchase orders with estimates of our requirements several months ahead of the delivery dates. These amounts are associated with agreements that are enforceable and legally binding. Our purchase obligations to our contract manufacturers and suppliers within the next year were $9.3 million as of December 31, 2014.