Leases - Material Office Leases (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Future Minimum Lease Commitments	$ 92,239
Arlington, VA
Lessee, Lease, Description [Line Items]
Lease Termination Term (in years)	11 years 9 months 18 days
Future Minimum Lease Commitments	$ 40,832
Letter of Credit Amount Required	$ 1,579
Riverside, IL
Lessee, Lease, Description [Line Items]
Lease Termination Term (in years)	11 years
Future Minimum Lease Commitments	$ 41,179
Letter of Credit Amount Required	$ 232
Louisville, KY
Lessee, Lease, Description [Line Items]
Lease Termination Term (in years)	6 years 3 months 18 days
Future Minimum Lease Commitments	$ 0
Letter of Credit Amount Required	0
Prepaid rent	$ 4,100
Pune, India
Lessee, Lease, Description [Line Items]
Lease Termination Term (in years)	3 years 6 months
Future Minimum Lease Commitments	$ 2,883
Letter of Credit Amount Required	$ 0
Brea, CA
Lessee, Lease, Description [Line Items]
Lease Termination Term (in years)	2 years 2 months 12 days
Future Minimum Lease Commitments	$ 2,328
Letter of Credit Amount Required	$ 0