Subsequent Events (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of Record and Payments Dates for Preferred Stock Dividends

On February 21, 2018, the Company’s board of directors declared a monthly cash dividend to holders of the Series F Preferred Stock for April 2018 through June 2018 with respect to the periods included in the table below. The corresponding record and payment dates for each month's Series F Preferred Stock dividend are also shown in the table below. The dividend for the Series F Preferred Stock accrues daily on a 360-day annual basis equal to an annualized dividend rate of $1.675 per share, or $0.1395833 per 30-day month.



Period	Record Date	Payment Date
March 15, 2018 - April 14, 2018	April 1, 2018	April 16, 2018
April 15, 2018 - May 14, 2018	May 1, 2018	May 15, 2018
May 15, 2018 - June 14, 2018	June 1, 2018	June 15, 2018