Earnings Per Share ("EPS") (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income available to common stockholders	$ 67,407	$ 77,223
Average common shares outstanding (in shares)	108,210	112,888
Average potential dilutive common shares (in shares)	445	249
Average diluted common shares (in shares)	108,655	113,137
Basic earnings per share (in dollars per share)	$ 0.62	$ 0.68
Diluted earnings per share (in dollars per share)	$ 0.62	$ 0.68