CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Preferred stock, authorized (in shares)	30,000,000
Preferred stock, outstanding (in shares)	6,799,467	6,799,467
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	250,000,000	250,000,000
Common stock, issued (in shares)	89,614,601	89,458,752
Common stock, outstanding (in shares)	89,614,601	89,458,752
Series A Preferred Stock
Preferred stock, dividend rate	7.25%	7.25%
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, liquidation preference (in dollars per share)	$ 25.00	$ 25.00
Preferred stock, authorized (in shares)	9,959,650	9,959,650
Preferred stock, issued (in shares)	6,799,467	6,799,467
Preferred stock, outstanding (in shares)	6,799,467	6,799,467
Series B Preferred Stock
Preferred stock, dividend rate	6.875%	6.875%
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, liquidation preference (in dollars per share)	$ 25.00	$ 25.00
Preferred stock, authorized (in shares)	11,450,000	11,450,000
Preferred stock, issued (in shares)	3,635,128	3,450,000
Preferred stock, outstanding (in shares)	3,635,128	3,450,000