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Commitments and Contingencies
 9 Months Ended
Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]  
Commitments and Contingencies Commitments and Contingencies
Operating and Capital Leases
We have entered into various non-cancelable operating leases, primarily related to office real estate, that expire through 2022 and generally contain renewal options for up to five years. Rent expense was $1.4 million, $3.8 million, $1.0 million and $2.6 million in the three and nine months ended September 30, 2018 and 2017, respectively.
We also lease computer and office equipment under non-cancelable capital leases that expire through 2022. The total obligations for capital lease arrangements were $1.1 million and $1.5 million at September 30, 2018 and December 31, 2017, respectively.
Future minimum non-cancelable lease payments for operating and capital leases at September 30, 2018 were as follows:
(in thousands)
 
Years ending December 31:
 
2018
$
1,404

2019
5,553

2020
4,197

2021
7,431

2022
6,183

Thereafter
58,294

Total future minimum lease payments
$
83,062


Total future minimum lease payments at September 30, 2018 includes $68.2 million of future lease payments related to the lease of our new headquarters, which is currently being constructed in Columbia, Maryland. These lease payments are expected to commence in the first quarter of 2021.