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Equity (Tables) | 3 Months Ended
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Mar. 31, 2022
Stockholders' Equity Note [Abstract] |
Dividends Declared [Table Text Block] | The following table summarizes the dividends declared on the Company’s outstanding shares of preferred stock during the year ended December 31, 2021.
Quarter Ended 2021 |  | Declaration Date |  | Series C Preferred Stock Per Share |  | Payment Date
March 31 |  | January 11, 2021 |  | $ | 0.4296875 |  |  | March 31, 2021
Total |  |  |  | $ | 0.4296875 |  |  |
Schedule of stock sale activity | The following table summarizes the terms of the Company’s at-the market (“ATM”) common stock offering program as of March 31, 2022.
ATM Common Stock Offering Program |  | Date |  | Maximum Aggregate Offering Price (in thousands) |  | Aggregate Available as of March 31, 2022 (in thousands)
2022 $750 million ATM |  | February 17, 2022 |  | $ | 750,000 |  |  | $ | 750,000 |
The following tables summarize the activity under the ATM common stock offering program during the three months ended March 31, 2022 and year ended December 31, 2021.
|  | Three months ended March 31, 2022
ATM Common Stock Offering Program |  | Shares Sold |  | Weighted Average Price Per Share |  |  |  |  |  | Net Proceeds (in thousands)
2019 $600 million ATM(1) |  | 128,335 |  |  | $ | 45.03 |  |  |  |  |  |  | $ | 5,721 |
Total/weighted average |  | 128,335 |  |  | $ | 45.03 |  |  |  |  |  |  | $ | 5,721 |
(1)This program ended before March 31, 2022.
|  | Year ended December 31, 2021
ATM Common Stock Offering Program(1) |  | Shares Sold |  | Weighted Average Price Per Share |  | Net Proceeds (in thousands)
2019 $600 million ATM(2) |  | 5,110,002 |  |  | $ | 37.53 |  |  | $ | 189,974 |
Total/weighted average |  | 5,110,002 |  |  | $ | 37.53 |  |  | $ | 189,974 |
(1)Excludes shares of common stock sold under the ATM common stock offering program on a forward basis or issued upon physical settlement of the related forward sale agreements during the period. (2)This program ended before March 31, 2022.
Common Stock Dividends Declared [Table Text Block] | The following tables summarize the dividends declared on the Company’s outstanding shares of common stock during the three months ended March 31, 2022 and the year ended December 31, 2021.
Month Ended 2022 |  | Declaration Date |  | Record Date |  | Per Share |  | Payment Date
March 31 |  | January 10, 2022 |  | March 31, 2022 |  | $ | 0.121667 |  |  | April 18, 2022
February 28 |  | January 10, 2022 |  | February 28, 2022 |  | 0.121667 |  |  | March 15, 2022
January 31 |  | January 10, 2022 |  | January 31, 2022 |  | 0.121667 |  |  | February 15, 2022
Total |  |  |  |  |  | $ | 0.365001 |  |  |
Month Ended 2021 |  | Declaration Date |  | Record Date |  | Per Share |  | Payment Date
December 31 |  | October 13, 2021 |  | December 31, 2021 |  | $ | 0.120833 |  |  | January 18, 2022
November 30 |  | October 13, 2021 |  | November 30, 2021 |  | 0.120833 |  |  | December 15, 2021
October 31 |  | October 13, 2021 |  | October 29, 2021 |  | 0.120833 |  |  | November 15, 2021
September 30 |  | July 13, 2021 |  | September 30, 2021 |  | 0.120833 |  |  | October 15, 2021
August 31 |  | July 13, 2021 |  | August 31, 2021 |  | 0.120833 |  |  | September 15, 2021
July 31 |  | July 13, 2021 |  | July 30, 2021 |  | 0.120833 |  |  | August 16, 2021
June 30 |  | April 12, 2021 |  | June 30, 2021 |  | 0.120833 |  |  | July 15, 2021
May 31 |  | April 12, 2021 |  | May 28, 2021 |  | 0.120833 |  |  | June 15, 2021
April 30 |  | April 12, 2021 |  | April 30, 2021 |  | 0.120833 |  |  | May 17, 2021
March 31 |  | January 11, 2021 |  | March 31, 2021 |  | 0.120833 |  |  | April 15, 2021
February 28 |  | January 11, 2021 |  | February 26, 2021 |  | 0.120833 |  |  | March 15, 2021
January 31 |  | January 11, 2021 |  | January 29, 2021 |  | 0.120833 |  |  | February 16, 2021
Total |  |  |  |  |  | $ | 1.449996 |  |  |
On April 14, 2022, the Company’s board of directors declared dividends of the Company’s outstanding shares of common stock for the months ending April 30, 2022, May 31, 2022, and June 30, 2022 at a monthly rate of $0.121667 per share.
Schedule of activity related to unvested restricted stock awards | the three months ended March 31, 2022 and the year ended December 31, 2021.
Unvested Restricted Shares of Common Stock |  | Shares |  | Weighted Average Grant Date Fair Value per Share
Balance at December 31, 2020 |  | 184,890 |  |  | $ | 27.70 |
Granted |  | 90,304 |  |  | $ | 29.77 |
Vested |  | (79,140) |  | (1) | $ | 27.01 |
Forfeited |  | (10,339) |  |  | $ | 30.32 |
Balance at December 31, 2021 |  | 185,715 |  |  | $ | 28.86 |
Granted |  | 58,580 |  |  | $ | 44.19 |
Vested |  | (73,556) |  | (1) | $ | 28.03 |
Forfeited |  | (6,373) |  |  | $ | 34.72 |
Balance at March 31, 2022 |  | 164,366 |  |  | $ | 34.47 |
(1)The Company repurchased and retired 25,836 and 27,706 restricted shares of common stock that vested during the three months ended March 31, 2022 and the year ended December 31, 2021, respectively.
Schedule of vested restricted shares of common stock activity | The following table summarizes the fair value at vesting for the restricted shares of common stock that vested during the three months ended March 31, 2022 and 2021.
|  | Three months ended March 31, |  |
Vested Restricted Shares of Common Stock |  | 2022 |  | 2021 |  |  |  |  |  |
Vested restricted shares of common stock |  | 73,556 |  |  | 72,788 |  |  |  |  |  |  |
Fair value of vested restricted shares of common stock (in thousands) |  | $ | 3,528 |  |  | $ | 2,280 |  |  |  |  |  |  |

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