Summary of Significant Accounting Policies - Future Amortization of Intangibles (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Above Market Ground Leases
Schedule of Finite-Lived Intangible Assets and Liabilities [Line Items]
2017, intangible liabilities	$ (455)
2018, intangible liabilities	(455)
2019, intangible liabilities	(447)
2020, intangible liabilities	(443)
2021, intangible liabilities	(354)
Thereafter, intangible liabilities	(42)
Total future amortization expenses, intangible liabilities	(2,196)	$ (2,651)
Below Market Ground Leases & Other
Schedule of Finite-Lived Intangible Assets and Liabilities [Line Items]
2017, intangible assets	2,306
2018, intangible assets	2,128
2019, intangible assets	1,752
2020, intangible assets	1,479
2021, intangible assets	1,465
Thereafter, intangible assets	10,044
Total future amortization expense, intangible assets	$ 19,174