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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases
The following table summarizes future minimum lease obligations under non-cancelable ground and other operating leases as of December 31, 2019 (in thousands):
2020
$
24,395

2021(1)
56,948

2022(1)
28,023

2023
19,322

2024
18,398

Thereafter
644,996

Total undiscounted minimum lease payments
792,082

Less: imputed interest
(540,886
)
Operating lease liabilities
$
251,196


(1) 
Obligations include payment of ground rent upon substantial completion of in progress research and innovation developments.