Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2021
Statement Of Financial Position [Abstract]
Allowance for receivables	$ 23,000,000.0	$ 900,000
Preferred Stock, Shares Authorized	2,357,299
Preferred Stock, 6 3/4% Cumulative Convertible, Shares Issued	155,250
Preferred Stock, 6 3/4% Cumulative Convertible, Shares Outstanding	155,250
Preferred Stock, Depository Shares	3,105,000
Preferred Stock, Dividend Rate, Percentage	6.75%
Preferred Stock, Liquidation Preference Per Share	$ 1,000
Preferred Stock Liquidation Depository Per Share	$ 50
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	96,000,000	96,000,000
Common Stock, Shares, Issued	50,680,605	500,000
Common Stock, Shares, Outstanding	50,680,605	500,000