Organization and Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]
Goodwill	$ 5,249				$ 5,249				$ 5,249	$ 5,249	$ 5,249	$ 5,249
Amortization of intangible assets									1,100	1,100
Increase in revenue	88,721	$ 81,374	$ 81,392	$ 85,305	$ 96,042	$ 88,103	$ 91,973	$ 86,282	336,792	362,400	367,490
Increase in expenses									364,108	512,675	422,153
Value of in-place lease intangibles
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets									3,300	2,400	2,000
Above/(Below) Market Leases
Finite Lived Intangible Assets [Line Items]
Increase in revenue									100	200	100
Above-market ground lease
Finite Lived Intangible Assets [Line Items]
Increase in expenses										$ 100	$ 100
Three Equity Method Investees
Finite Lived Intangible Assets [Line Items]
Goodwill	$ 1,500								$ 1,500