Stockholders' Equity - Equity Transactions (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
	Jan. 28, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Proceeds from issuance of common stock		$ 328,780	$ 54,575	$ 321,860
Payments for common stock repurchased		$ 0	$ (777)	$ (16,965)
Common Stock
Class of Stock [Line Items]
Shares issued (in shares)		28,628	6,287	16,064
Common stock repurchased (in shares)			(40)	(1,000)
Per Share price (in dollars per share)			$ 19.42	$ 17.77
Proceeds from issuance of common stock		$ 29	$ 6	$ 16
Payments for common stock repurchased			$ (777)	$ (17,768)
Common stock ATM Sales Agreement | Common Stock
Class of Stock [Line Items]
Preferred stock issued (in shares)			6,287
Shares issued (in shares)		10,713		884
Per Share price (in dollars per share)		$ 12.07	$ 8.68	$ 20.98
Proceeds from issuance of common stock		$ 129,336	$ 54,575	$ 18,540
2021 Common stock ATM Sales Agreement | Common Stock
Class of Stock [Line Items]
Preferred stock issued (in shares)		17,915
Per Share price (in dollars per share)		$ 11.13
Proceeds from issuance of preferred stock, net		$ 199,444
January Public Offering | Common Stock
Class of Stock [Line Items]
Shares issued (in shares)				6,900
Per Share price (in dollars per share)				$ 20.00
Proceeds from issuance of common stock				$ 137,946
February Public Offering | Common Stock
Class of Stock [Line Items]
Shares issued (in shares)				8,280
Per Share price (in dollars per share)				$ 19.98
Proceeds from issuance of common stock				$ 165,374
Series C Preferred Stock
Class of Stock [Line Items]
Proceeds from issuance of common stock		36,585	130,138
Proceeds from issuance of preferred stock, net		$ 36,585	$ 130,138	0
Series C Preferred Stock | Preferred C ATM Sales Agreement
Class of Stock [Line Items]
Preferred stock issued (in shares)		1,500	1,897
Per Share price (in dollars per share)		$ 24.38	$ 24.70
Proceeds from issuance of common stock		$ 36,585	$ 46,856
Series C Preferred Stock | Preferred C Underwritten Offering
Class of Stock [Line Items]
Preferred stock issued (in shares)			3,450
Shares issued (in shares)	3,450
Per Share price (in dollars per share)			$ 24.14
Proceeds from issuance of common stock	$ 83,282		$ 83,282
Series B Preferred Stock
Class of Stock [Line Items]
Proceeds from issuance of common stock				49,795
Proceeds from issuance of preferred stock, net		$ 0	$ 0	$ 44,289
Series B Preferred Stock | Preferred B ATM Sales Agreement
Class of Stock [Line Items]
Preferred stock issued (in shares)				100
Per Share price (in dollars per share)				$ 24.81
Proceeds from issuance of preferred stock, net				$ 2,489
Series B Preferred Stock | Preferred B ATM Sales Agreement
Class of Stock [Line Items]
Preferred stock issued (in shares)				1,914
Per Share price (in dollars per share)				$ 24.74
Proceeds from issuance of preferred stock, net				$ 47,306