(9) Commitments and Contingencies (a) Operating Leases Rent expense for office space, warehouse facilities and certain corporate equipment for the years ended December 31, 2013, 2012 and 2011 was $1.6 million, $1.1 million and $0.8 million, respectively. Commitments for future minimum lease payments for non-cancelable leases are as follows (in thousands): 2014 $ 1,083 2015 959 2016 852 2017 785 2018 632 Thereafter 611 $ 4,922 (b) Operating Lease Facility On August 4, 2009, the Partnership entered into an operating lease facility with Caterpillar Financial Services Corporation ( CFSC ), whereby the Partnership had the ability to lease compression equipment with an aggregate value of up to $45 million. The Partnership paid commitment and arrangement fees of $0.2 million. As part of the facility, the Partnership would pay 150 basis points, amended December 23, 2010 to 220 basis points, on the value of the equipment for each lease as funded. The facility was available for leases with inception dates up to and including June 30, 2011, subject to renewals at the discretion of CFSC, and mitigated the need to use available capacity under the existing senior debt facility. Each compressor leased under this facility had a lease term of one hundred twenty (120) months with a buyout option of 25% of cost which approximated fair value at the end of the lease term. At the end of the lease term, the Partnership also had an option to extend the lease term for an additional period of sixty (60) months at an adjusted rate equal to the fair market rate at the time. In the event the Partnership elected not to exercise the buyout or renewal option, the equipment was to be returned in a manner fit for use at the end of the lease term. In addition to the fair value buyout option at the end of the lease term, early buyout option provisions existed at month sixty (60) and at month eighty four (84) of the one hundred twenty (120) month lease term. On December 15, 2011, the Partnership purchased all the compression units previously leased