Net Income (Loss) per Share - Basic and Diluted Net Income per Share of Common Stock Using Two-Class Method (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Basic Earnings
Net income (loss)	$ 60,392	$ 67,691	$ 58,335	$ 49,338	$ 60,201	$ (127,842)	$ 186,418	$ (18,303)
Less: Preferred dividends	(3,126)			(3,385)			(9,896)	(10,155)
Net income (loss) available to common stockholders	57,266			45,953			176,522	(28,458)
Less: Dividends on participating securities	(874)			(717)			(2,570)	(2,238)
Basic Earnings	56,392			45,236			173,952	(30,696)
Diluted Earnings
Basic Earnings	56,392			45,236			173,952	(30,696)
Add: Dividends on participating securities	874			0			2,570	0
Add: Interest expense on Convertible Notes	8,277			0			24,783	0
Diluted Earnings	$ 65,543			$ 45,236			$ 201,305	$ (30,696)
Number of Shares:
Basic weighted-average shares of common stock outstanding	139,891,777			146,612,313			139,860,882	150,679,773
Diluted weighted-average shares of common stock outstanding	170,884,172			146,612,313			170,836,682	150,679,773
Earnings Per Share Attributable to Common Stockholders
Basic (in dollars per share)	$ 0.40			$ 0.31			$ 1.24	$ (0.20)
Diluted (in dollars per share)	$ 0.38			$ 0.31			$ 1.18	$ (0.20)