COMMITMENTS AND CONTINGENCIES Capital Leases The following is a schedule of future minimum lease payments due under capital lease obligations as of December31, 2016 (in thousands): 2017 $ 1,484 2018  Total minimum lease payments 1,484 Less: amounts representing interest (27 ) Present value of minimum lease payments 1,457 Less: current portion (1,457 ) Capital lease obligation, long-term $  The following assets are capitalized under capital leases at the end of each period presented (in thousands): December31, 2015 2016 Equipment and hardware $ 44,984 $ 44,984 Furniture and fixtures 1,053 1,053 Subtotal 46,037 46,037 Less: accumulated amortization (38,713 ) (42,051 ) Net assets under capital leases $ 7,324 $ 3,986 Operating Leases The Company leases office space under noncancelable operating lease agreements. The leases terminate at various dates through 2024 and generally provide for scheduled rent increases. The Company leases 91,574 square feet of office space for its corporate headquarters in Sterling, Virginia from a third party. The initial term of the lease commenced on October 1, 2010 and terminates January31,2021. 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 December31, 2016 , are as follows (in thousands): 2017 $ 23,886 2018 22,551 2019 21,904 2020 20,733 2021 16,224 Thereafter 27,718 $ 133,016 Future minimum sublease receipts under noncancelable operating leases for the years ended December 31, 2017 , 2018 , and 2019 , are expected to be approximately $6.5 million , $5.9 million , and $4.6 million , respectively. Rent expense was $14.1 million , $11.5 million , and $15.4 million for the