Real Estate Property Asset Acquisitions (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Real Estate [Line Items]
Acquired in-place leases, net	$ 31,224	$ 6,281
Prepaid expenses, deposits and other	7,225	6,683
TOTAL ASSETS	2,790,333	2,198,250
Accounts payable and accrued expenses	62,576	46,616
Security deposits payable	8,316	8,844
Other liabilities and deferred credits	68,110	49,547
Liabilities	1,496,661	$ 1,395,779
La Jolla Commons
Real Estate [Line Items]
Land	82,759
Buildings	361,471
Land improvements	1,359
Furniture, fixtures, and equipment	30,822
Total real estate	476,411
Acquired in-place leases, net	40,082
Prepaid expenses, deposits and other	13
TOTAL ASSETS	516,506
Accounts payable and accrued expenses	3,578
Security deposits payable	443
Other liabilities and deferred credits	3,817
Liabilities	$ 7,838