Investments in Unconsolidated Entities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Variable Interest Entity [Line Items]
Investments in joint ventures included in unconsolidated entities	$ 1,570,146		$ 1,570,146		$ 1,386,672
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Investments in joint ventures included in unconsolidated entities	71,900		71,900		$ 74,400
Loss attributable to variable interest entities	$ 2,300	$ 6,900	$ 6,900	$ 10,900