CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Class of Stock [Line Items]
Interest costs capitalized	$ 1,100	$ 1,100	$ 1,943	$ 1,682
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%		4.43937%