Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income	$ 27,623	$ 54,545	$ 66,293	$ 147,617
Preferred dividends	(4,033)	0	(5,070)	0
Net income applicable to unvested restricted shares	(236)	(465)	(615)	(1,257)
Net income applicable to common shares	$ 23,354	$ 54,080	$ 60,608	$ 146,360
Weighted-average common shares outstanding:
Weighted-average common shares outstanding (basic) (in Shares)	113,160	109,281	112,079	107,852
Dilutive effect of common stock equivalents (in Shares)	276	381	322	394
Weighted-average diluted common shares outstanding (in Shares)	113,436	109,662	112,401	108,246
Basic EPS (in dollars per share)	$ 0.21	$ 0.49	$ 0.54	$ 1.36
Diluted EPS (in dollars per share)	$ 0.21	$ 0.49	$ 0.54	$ 1.35