Equity Preferred Stock (Details) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 15, 2018 USD ($) $ / shares shares	Dec. 31, 2019 $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 shares
Class of Stock [Line Items]
Depository shares (in shares) | shares	2,000,000	0	0	2,000,000
Depository shares interest in preferred stock		0.025
Preferred stock dividend rate		6.95%	6.95%
Preferred stock, par value (in dollars per shares)		$ 1.00	$ 1.00
Preferred stock, liquidation preference (in dollars per share)		$ 1,000	$ 1,000
Stock redeemed | $			$ 50,000
Depositary share aggregate liquidation preference | $	$ 50,000
Depositary shares redemption percentage	100.00%
Depositary share redemption price her share (in dollars per share)	$ 25.00
Series D Preferred Stock
Class of Stock [Line Items]
Preferred stock dividend rate		6.95%
Preferred stock, par value (in dollars per shares)		$ 1.00
Preferred stock, liquidation preference (in dollars per share)	$ 1,000.00	$ 1,000
Stock redeemed | $	$ 50,000
Redemption price percentage	100.00%
Stock redeemed (in shares) | shares	50,000