Earnings (Loss) Per Common Share and Stockholders' Equity (Stockholders' Equity) (Details) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended	6 Months Ended
	Jun. 10, 2020	Jun. 01, 2020	Mar. 01, 2020	Nov. 21, 2019	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Class of Stock [Line Items]
Proceeds from issuance of preferred stock, net						$ 290,260	$ 0
Dividends paid on preferred stock					$ 5,950	$ 12,561
Preferred Stock, Series B
Class of Stock [Line Items]
Preferred stock, shares issued	12,000				12,000	12,000
Preferred stock, dividend rate, percentage	6.625%
Preferred stock, par value per share	$ 1.00				$ 1	$ 1
Preferred stock, liquidation preference, per share	$ 25,000
Proceeds from issuance of preferred stock, net	$ 290,300
Preferred Stock, Series A
Class of Stock [Line Items]
Preferred stock, shares issued				16,000	16,000	16,000		16,000
Preferred stock, dividend rate, percentage				5.95%
Preferred stock, par value per share				$ 1.00	$ 1	$ 1		$ 1
Preferred stock, liquidation preference, per share				$ 25,000
Proceeds from issuance of preferred stock, net				$ 388,900
Dividends paid on preferred stock		$ 6,000	$ 6,600