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Common and Preferred Stock (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 8 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) shares | Jan. 31, 2021 USD ($) shares | Apr. 30, 2020 USD ($) shares | Dec. 31, 2021 $ / shares | Sep. 30, 2021 USD ($) $ / shares shares | Mar. 31, 2021 shares | Sep. 30, 2020 shares | Jun. 30, 2020 shares | Mar. 31, 2020 USD ($) shares | Dec. 31, 2019 shares | Dec. 31, 2020 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) $ / shares shares | May 31, 2021 shares | Apr. 30, 2021 shares | Feb. 28, 2021 USD ($) | Jul. 31, 2019 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized | 180,000,000 |  |  |  |  | 180,000,000 |  |  |  |  |  | 90,000,000 | 180,000,000 |  | 90,000,000 | 180,000,000 | 90,000,000 |  |
Proceeds from common stock offerings, net | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 650,859 | $ 629,586 |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.0001 |  |  |  |  | $ 0.0001 |  |  |  |  |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001 |  |  |  |
Preferred stock, shares authorized | 4,000,000 |  |  |  |  | 4,000,000 |  |  |  |  |  | 4,000,000 | 4,000,000 |  | 4,000,000 |  |  |  |
Proceeds from Series A preferred stock offering, net | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 170,285 |  |  |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding | 7,000 |  |  |  |  | 7,000 |  |  |  |  |  | 0 | 7,000 |  | 0 |  |  |  |
Preferred stock, dividend rate, percentage | 4.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference, Value | $ | $ 25,000 |  |  |  |  | $ 25,000 |  |  |  |  |  |  | $ 25,000 |  |  |  |  |  |
Number of Shares Exchanged, Underlying Depository Shares | 7,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share | $ / shares | $ 25.00 |  |  |  |  | $ 25.00 |  |  |  |  |  |  | $ 25.00 |  |  |  |  |  |
Cash dividends declared per depositary share of Series A preferred stock | $ / shares | 0.041 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Redemption Price Per Share | $ / shares | $ 25.00 |  |  |  |  | $ 25.00 |  |  |  |  |  |  | $ 25.00 |  |  |  |  |  |
Redeemable Preferred Stock [Member] | Scenario, Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per depositary share of Series A preferred stock | $ / shares |  |  |  |  | $ 0.08854 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividends declared per annum (in dollars per share) | $ / shares |  |  |  |  | $ 1.0625 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  | 2,875,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net of issuance costs (in shares) |  |  |  |  |  | 885,912 | 4,028,410 | 1,515,000 | 6,851,695 | 1,400,251 |  |  |  |  |  |  |  |  |
Proceeds from common stock offerings, net | $ |  |  |  | $ 170,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] | Forward Sale Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  | 4,600,000 | 3,450,000 | 6,166,666 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from common stock offerings, net | $ |  | $ 327,000 |  |  |  |  |  |  |  |  |  | $ 354,600 |  |  |  |  |  |  |
At-Market Equity Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares |  |  |  |  |  |  |  |  |  | 3,169,754 |  |  |  |  |  |  |  |  |
At-Market Equity Program Two [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares |  |  |  |  |  |  |  |  |  |  | 2,003,118 |  |  |  |  |  |  |  |
Proceeds from common stock offerings, net | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 359,500 |  |  |  |
Value Of Equity Instruments To Be Issued | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000
At-Market Equity Program Three [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value Of Equity Instruments To Be Issued | $ | $ 0 |  |  |  |  | $ 0 |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
At-Market Equity Program Four [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,334,056 |  |  |  |
Issuance of common stock, net of issuance costs (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,628,772 |  | 204,074 |  |  |  |
Proceeds from common stock offerings, net | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 102,800 |  | $ 12,500 |  |  |  |
Value Of Equity Instruments To Be Issued | $ |  |  |  |  |  |  |  |  |  | $ 400,000 |  |  |  |  |  |  |  |  |
At-Market Equity Program Five [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net of issuance costs (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Value Of Equity Instruments To Be Issued | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |
Over-Allotment Option [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net of issuance costs (in shares) | 7,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 0.001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Series A preferred stock offering, net | $ | $ 170,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] | Redeemable Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net of issuance costs (in shares) | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  | 375,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] | Common Stock [Member] | Forward Sale Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  | 600,000 | 450,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] | Forward Sale Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from common stock offerings, net | $ |  |  | $ 221,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] | At-Market Equity Program Four [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value Of Equity Instruments To Be Issued | $ | $ 0 |  |  |  |  | $ 0 |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Common Stock [Member] | At-Market Equity Program Five [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares |  |  |  |  |  |  |  |  |  |  |  |  | 1,918,130 |  |  |  |  |  |

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