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Commitments and Contingencies - Operating Ground Leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
2018 (remainder)	$ 347		$ 347
2019	1,390		1,390
2020	1,390		1,390
2021	1,390		1,390
2022	1,390		1,390
2023	1,390		1,390
Thereafter	41,085		41,085
Total	48,382		48,382
Rent expense	$ 400	$ 300	$ 1,100	$ 1,000

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Operating Leases, Future Minimum Payments, Due After 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.

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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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