Commitments and Contingencies - Minimum Future Obligation Payments Required Under Ground Leases (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Other Leases
Minimum future obligation payments required under ground leases
2018 (remaining six months)	$ 635
2019	1,273
2020	1,320
2021	1,326
2022	1,329
2023	1,332
Thereafter	69,225
Total	76,440
Office Lease
Minimum future obligation payments required under ground leases
2018 (remaining six months)	389
2019	792
2020	812
2021	832
2022	853
2023	873
Thereafter	2,436
Total	$ 6,987

Operating Leases, Future Minimum Payments, Due in Six Years

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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-Publisher FASB
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-SubTopic 20
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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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