Earnings Per Share ("EPS") (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 available to common stockholders	$ 65,885	$ 81,826	$ 201,897	$ 185,119
Average common shares outstanding (in shares)	109,019	96,608	110,292	95,090
Average potential dilutive common shares (in shares)	189	360	189	360
Average diluted common shares (in shares)	109,208	96,968	110,481	95,450
Basic earnings per share (in dollars per share)	$ 0.60	$ 0.85	$ 1.83	$ 1.95
Diluted earnings per share (in dollars per share)	$ 0.60	$ 0.84	$ 1.83	$ 1.94