CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Class of Stock [Line Items]
Interest costs capitalized	$ 1,200	$ 1,300	$ 3,106	$ 2,993
4.00% Cumulative Redeemable Convertible Preferred Units
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage			4.00%
4.43937% Cumulative Redeemable Convertible Preferred Units
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage				4.43937%