Stockholders' Equity (Preferred Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended	12 Months Ended
	Feb. 11, 2020	Oct. 03, 2019	Aug. 22, 2017	May 31, 2014	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock E, Value, Issued		$ 390,000
Preferred Stock E, Liquidation Preference, Value		$ 403,000
Preferred Stock F, Value, Issued	$ 557,000
Preferred Stock D, Value, Issued					$ 227,000
Preferred Stock D, Liquidation Preference, Value					235,000
Preferred Stock C, Value, Issued					315,000
Preferred Stock C, Liquidation Preference, Value					325,000
Preferred Stock, Value, Issued					1,634,000	$ 1,489,000
Preferred Stock, Liquidation Preference, Value					$ 1,688,000	$ 1,538,000
Preferred Stock G, Value, Issued	$ 145,000
Preferred Stock, Shares Authorized					10,000,000
Series B Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Percent Interest Per Share				0.10%
Series C Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Capital Shares Reserved for Future Issuance					13,800
Preferred Stock, Dividend Rate, Percentage			7.00%		9.19%
Preferred Stock Dividend Payment Rate Variable Rate Spread					5.111%
Preferred Stock, Liquidation Preference Per Share					$ 25.00
Preferred Stock, Shares Issued					13,000
Preferred Stock, Dividedn Rate, Percentage, Basis Spread					5.111%
Series D Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Capital Shares Reserved for Future Issuance					10,350
Preferred Stock, Dividend Rate, Percentage					6.875%
Preferred Stock Dividend Payment Rate Variable Rate Spread					4.332%
Preferred Stock, Shares Issued					9,400
Preferred Stock, Dividedn Rate, Percentage, Basis Spread					4.332%
Series E Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Capital Shares Reserved for Future Issuance					16,100
Preferred Stock, Dividend Rate, Percentage		6.50%
Preferred Stock, Shares Issued					16,100
Preferred Stock, Dividedn Rate, Percentage, Basis Spread					4.993%
Series F Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Capital Shares Reserved for Future Issuance					23,000
Preferred Stock, Dividend Rate, Percentage	6.125%
Preferred Stock, Shares Issued					23,000
Preferred Stock, Liquidation Preference, Value	$ 575,000
Preferred Stock, Dividedn Rate, Percentage, Basis Spread					4.697%
Series G Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Capital Shares Reserved for Future Issuance					6,900
Preferred Stock, Dividend Rate, Percentage					7.75%
Preferred Stock, Shares Issued					6,000
Preferred Stock, Liquidation Preference, Value	$ 150,000
Preferred Stock, Dividedn Rate, Percentage, Basis Spread					4.39%
Depositary Share [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Shares Issued					67,500,000
Depositary Share [Member] | Series C Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Shares Issued					13,000,000.0
Depositary Share [Member] | Series D Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Shares Issued					9,400,000
Depositary Share [Member] | Series E Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Shares Issued		16,100,000
Depositary Share [Member] | Series F Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Shares Issued	23,000,000.0
Depositary Share [Member] | Series G Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Shares Issued	6,000,000.0