Real Estate La Jolla Commons Financial Results (Details) - USD ($) $ in Thousands	3 Months Ended								6 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, 2019	Dec. 31, 2018	Dec. 31, 2017
Real Estate [Line Items]
Total revenue	$ 98,947	$ 98,362	$ 84,113	$ 85,319	$ 82,605	$ 82,507	$ 85,023	$ 80,732		$ 366,741	$ 330,867	$ 314,983
Operating Expenses										253,056	251,332	221,337
Operating income (loss)	29,993	30,384	24,487	28,821	22,091	27,275	17,249	12,920		113,685	79,535	93,646
Net income	$ 16,485	$ 16,519	$ 11,941	$ 15,243	$ 9,209	$ 14,271	$ 4,413	$ (691)		$ 60,188	$ 27,202	$ 40,132
La Jolla Commons
Real Estate [Line Items]
Total revenue									$ 20,579
Operating Expenses									18,140
Operating income (loss)									2,439
Net income									$ 2,650