Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies Commitments and Contingencies - Future Minimum Rental Payments Due under Terms of Leases (Details)

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Commitments and Contingencies Commitments and Contingencies - Future Minimum Rental Payments Due under Terms of Leases (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Operating Leased Assets [Line Items]    
2019 $ 77,289 $ 103,322
2020 97,758 97,302
2021 90,374 89,057
2022 83,723 82,336
2023 75,744 74,337
Thereafter 217,638 279,424
Tenant Lease Payments $ 709,080 725,778
Ground Leases    
Operating Leased Assets [Line Items]    
2019   465
2020   466
2021   392
2022   319
2023   322
Thereafter   3,914
Tenant Lease Payments   $ 5,878