Real Estate - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Real Estate [Abstract]
Net gain on sales of real estate properties	$ 130,565	$ 114,672	$ 269,400	$ 256,834
Net gain on sales of unconsolidated entities			69,500
Net gain on sales of land parcels	$ 1,899		$ 2,077	$ 995