Subsequent Events	6 Months Ended
Jun. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	10. Subsequent Events Dividends on 6% Preferred Stock On June 15, 2021, the board of directors declared a quarterly cash dividend in the amount of $0.15 per share on the Company’s Preferred Stock. The cash dividend was paid on August 1, 2021 to the holders of record of the 6% Preferred Stock as of the close of business on July 16, 2021. Controlled Equity Offering Sales Agreement On August 12, 2021, the Company entered into a Controlled Equity Offering Sales Agreement (the “Sales Agreement”) with Cantor Fitzgerald & Co. ("Cantor"), pursuant to which it may issue and sell, from time to time, shares of its common stock having an aggregate offering price of up to $50.0 million through Cantor as the sales agent. Cantor may sell the Company’s common stock by any method permitted by law deemed to be an “at the market offering” as defined in Rule 415(a)(4) of the Securities Act. Subject to the terms and conditions of the Sales Agreement, Cantor will use commercially reasonable efforts consistent with its normal trading and sales practices to sell the shares from time to time, based upon the Company's instructions, including any price, time or size limits specified by the Company. The Company has provided Cantor with customary indemnification rights, and Cantor will be entitled to a commission at a fixed commission rate equal to 3.0% of the gross proceeds per share sold. The Company has no obligation to sell any of the shares and may at any time suspend sales under the Sales Agreement or terminate the Sales Agreement. The Sales Agreement will terminate upon the sale of all of the shares under the Sales Agreement unless terminated earlier by either party as permitted under the Sales Agreement.

Subsequent Events

6 Months Ended

Jun. 30, 2021

10. Subsequent Events

Dividends on 6% Preferred Stock

On June 15, 2021, the board of directors declared a quarterly cash dividend in the amount of $0.15 per share on the Company’s Preferred Stock. The cash dividend was paid on August 1, 2021 to the holders of record of the 6% Preferred Stock as of the close of business on July 16, 2021.

Controlled Equity Offering Sales Agreement

On August 12, 2021, the Company entered into a Controlled Equity Offering Sales Agreement (the “Sales Agreement”) with Cantor Fitzgerald & Co. ("Cantor"), pursuant to which it may issue and sell, from time to time, shares of its common stock having an aggregate offering price of up to $50.0 million through Cantor as the sales agent. Cantor may sell the Company’s common stock by any method permitted by law deemed to be an “at the market offering” as defined in Rule 415(a)(4) of the Securities Act.

Subject to the terms and conditions of the Sales Agreement, Cantor will use commercially reasonable efforts consistent with its normal trading and sales practices to sell the shares from time to time, based upon the Company's instructions, including any price, time or size limits specified by the Company. The Company has provided Cantor with customary indemnification rights, and Cantor will be entitled to a commission at a fixed commission rate equal to 3.0% of the gross proceeds per share sold. The Company has no obligation to sell any of the shares and may at any time suspend sales under the Sales Agreement or terminate the Sales Agreement. The Sales Agreement will terminate upon the sale of all of the shares under the Sales Agreement unless terminated earlier by either party as permitted under the Sales Agreement.