Interest and Other Income (Loss), net - Schedule Of Interest And Other Income (Loss), net (Parenthetical) (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Preferred equity investment income	$ 1,460	$ 4,299
Preferred equity ownership percentage	24.40%	24.40%
PGRESS Equity Holdings L.P. [Member]
Schedule Of Investment Income Reported Amounts By Category [Line Items]
Preferred equity investment income	$ 355	$ 1,047
Preferred equity ownership percentage	24.40%	24.40%