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Stockholders' Equity (ATM Program) (Details) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Oct. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Class of Stock [Line Items] |  |  |  |  |
Total allowable shares (in shares) |  |  | 375,000,000 |  | 375,000,000
Total shares issued (in shares) |  |  | 175,810,465 |  | 175,635,792
Net proceeds |  |  | $ 748,000 | $ 1,882,000 |
Stock issuance costs |  |  | $ 48,000 | $ 5,145,000 |
Series F Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares redeemed (in shares) |  | 13,800,000 |  |  |
Dividend rate |  | 5.20% |  |  |
Stated liquidation value per share (in dollars per share) |  | $ 25.00 |  |  |
Aggregate redemption price (in dollars per share) |  | $ 25.111944 |  |  |
Excess of redemption value over carrying value of preferred shares redeemed |  | $ 10,897,000 |  |  |
ATM equity programs |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares of common stock (in shares) |  |  |  | 30,000 |
Average price per share (net) (in dollars per share) |  |  |  | $ 38.59 |
Net proceeds |  |  |  | $ 1,158,000 |
Stock issuance costs | [1] |  |  | $ 75,000 |
2020 ATM |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Total allowable shares (in shares) |  |  | 17,500,000 |  |
Total shares issued (in shares) |  |  | 1,599,304 |  |
[1] | Stock issuance costs consist primarily of underwriters' fees and commissions, and legal and accounting fees.

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