COMMITMENTS AND CONTINGENCIES Capital Leases The following is a schedule of future minimum lease payments due under capital lease obligations as of December 31, 2013 (in thousands): 2014 $ 2,404 2015 1,246 2016 935 Total minimum lease payments 4,585 Less: amounts representing interest (272 ) Present value of minimum lease payments 4,313 Less: current portion (1,894 ) Capital lease obligation, long-term $ 2,419 The following assets are capitalized under capital leases at the end of each period presented (in thousands): December 31, 2012 2013 Equipment and hardware $ 35,322 $ 36,515 Furniture and fixtures 334 334 Subtotal 35,656 36,849 Less: accumulated amortization (33,708 ) (32,423 ) Net assets under capital leases $ 1,948 $ 4,426 Operating Leases The Company leases office space under noncancelable operating lease agreements. The leases terminate at various dates through 2023 and generally provide for scheduled rent increases. The Company leases 91,574 square feet of office space for its corporate headquarters in Sterling, Virgina from a third party. The initial term of the lease commenced on October 1, 2010 and terminates January 31, 2021. The Company has two five -year options to renew the lease, and the rent for the applicable renewal term will be determined if and when the Company exercises its applicable option to renew the lease. The Company recognizes rent incentives and leasehold improvements funded by landlord incentives on a straight-line basis, as a reduction of rent expense, over the initial term of the lease. Future minimum lease payments under noncancelable operating leases as of December 31, 2013 , are as follows (in thousands): 2014 $ 13,033 2015 16,102 2016 17,393 2017 18,624 2018 18,464 Thereafter 72,766 $ 156,382 Rent expense was $9.6 million , $12.8 million , and $12.6 million for the years ended December 31, 2011 , 2012 and 2013 , respectively. Contingencies Currently, and from time to time, the Company is involved in litigation incidental to the conduct of its business. The Company is not a