Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Dividends Payable [Line Items]
minority interest partnership units outstanding	742,413		742,413
Common Stock, Dividends, Per Share, Declared	$ 0.175	$ 0.2625	$ 0.6125	$ 0.785
dividends common stock declared			$ 29,895	$ 34,599
Dividends, Preferred Stock, Cash			$ 135,055	117,809
Common Stock, Shares, Outstanding	49,900,555		49,900,555
Series A Preferred Stock [Member]
Dividends Payable [Line Items]
Preferred Stock, Dividend Rate, Per-Dollar-Amount			$ 5.00
Dividends, Preferred Stock, Cash			$ 97,272	79,351
Series M1 Preferred Stock
Dividends Payable [Line Items]
Dividends, Preferred Stock, Cash			$ 217	$ 0
Minimum [Member] | mShares [Domain]
Dividends Payable [Line Items]
Preferred Stock, Dividend Rate, Per-Dollar-Amount			$ 4.79
Minimum [Member] | Series M1 Preferred Stock
Dividends Payable [Line Items]
Preferred Stock, Dividend Rate, Per-Dollar-Amount			5.08
Maximum [Member] | mShares [Domain]
Dividends Payable [Line Items]
Preferred Stock, Dividend Rate, Per-Dollar-Amount			6.25
Maximum [Member] | Series M1 Preferred Stock
Dividends Payable [Line Items]
Preferred Stock, Dividend Rate, Per-Dollar-Amount			$ 5.92