Interest and Other Income, net - Schedule Of Interest And Other Income, net (Parenthetical) (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Preferred equity investment income	$ 1,423	$ 2,839
Preferred equity ownership percentage	24.40%	24.40%
PGRESS Equity Holdings L.P
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Preferred equity investment income	$ 347	$ 692
Preferred equity ownership percentage	24.40%	24.40%