Redeemable Preferred Stock (Details)			3 Months Ended
	Feb. 14, 2020 USD ($) $ / shares shares	Sep. 27, 2019	Mar. 31, 2022 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) shares	Dec. 31, 2021 USD ($) $ / shares shares
Class of Stock [Line Items]
gross potential offering proceeds			$ 1,125,000,000
Quarterly dividend declared (in dollars per share) | $ / shares			$ 0.175
Proceeds from Other Equity			$ 326,889,000
daycountvolweightedavgcalcformarketvalue			20
aggregate offering costs			$ 37,999,000
prorataamountofferingcostsreclassed			9,396,000
deferred offering costs not yet reclassified			787,000
shares common stock from warrant exercises | shares	20
Deferred offering costs			10,183,000
specifically identifiable offering costs			27,816,000
Aggregate Offering Expenses, Maximum As a Percentage Of Gross Proceeds		12.00%
Preferred Stock, Par or Stated Value Per Share | $ / shares	$ 0.01
Dividends, Common Stock, Cash			10,976,000	$ 8,991,000
Sale Of Stock, Maximum Consideration Received On Transaction	$ 1,500,000,000
Proceeds from Issuance of Common Stock			(19,162,000)	(40,018,000)
Stock Redeemed or Called During Period, Value			$ 19,180,000	$ 40,038,000
mShares [Domain]
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding | shares				87,000
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage			6.00%
preferred stock | shares			2,226,000		2,226,000
Preferred Stock, Par or Stated Value Per Share | $ / shares			$ 0.01		$ 0.01
Preferred Stock, Value, Issued			$ 13,000		$ 13,000
Preferred Stock, Shares Outstanding | shares			1,302,000	1,694,000	1,321,000
Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Sale Of Stock, Maximum Shares Sold | shares	1,000,000
Common Stock [Member]
Class of Stock [Line Items]
Common Stock, Shares, Issued | shares			62,929,000		52,975,000
Sale Of Stock, Maximum Consideration Received On Transaction	$ 125,000,000
Series M1 Preferred Stock
Class of Stock [Line Items]
preferred stock | shares			47,000		43,000
Preferred Stock, Par or Stated Value Per Share | $ / shares			$ 0.01		$ 0.01
Preferred Stock, Shares Outstanding | shares			44,000	21,000	41,000
Series A1 Preferred Stock
Class of Stock [Line Items]
preferred stock | shares			247,000		247,000
Preferred Stock, Par or Stated Value Per Share | $ / shares			$ 0.01		$ 0.01
Preferred Stock, Shares Outstanding | shares			246,000	184,000	246,000
Preferred Stock [Member]
Class of Stock [Line Items]
Shares redeemed during period (in shares) | shares			21,189
Stock Redeemed or Called During Period, Value			$ 20,800,000
$1.5 billion unit [Domain]
Class of Stock [Line Items]
maximum shares available to be issued | shares			1,500,000
2016 Shelf Offering [Member] [Domain]
Class of Stock [Line Items]
gross potential offering proceeds			$ 125,000,000
Proceeds from Other Equity			33,199,000
aggregate offering costs			1,848,000
prorataamountofferingcostsreclassed			540,000
deferred offering costs not yet reclassified			787,000
Deferred offering costs			1,327,000
specifically identifiable offering costs			521,000
series A1M1 offering [Domain]
Class of Stock [Line Items]
gross potential offering proceeds			1,000,000,000
Proceeds from Other Equity			293,690,000
aggregate offering costs			36,151,000
prorataamountofferingcostsreclassed			8,856,000
deferred offering costs not yet reclassified			0
Deferred offering costs			8,856,000
specifically identifiable offering costs			$ 27,295,000