Cumulative Other Comprehensive Loss - Schedule of Reclassifications Out of Cumulative Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reclassifications out of cumulative other comprehensive income (loss)
Interest expense	$ 5,085	$ 11,510	$ 21,550	$ 41,387
Interest and other income, net	(12,626)	$ (7,596)	(31,074)	$ (17,987)
Amount reclassified			(372)
Amounts Reclassified from Cumulative Other Comprehensive Loss to Net Income
Reclassifications out of cumulative other comprehensive income (loss)
Amount reclassified	0		372
Amounts Reclassified from Cumulative Other Comprehensive Loss to Net Income | Interest rate cap
Reclassifications out of cumulative other comprehensive income (loss)
Interest expense	0		79
Interest and other income, net	$ 0		$ 293