Earnings Per Share ("EPS") (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income available to common stockholders	$ 58,789	$ 55,598	$ 136,012	$ 103,293
Average common shares outstanding (in shares)	108,982	96,098	110,936	94,318
Average potential dilutive common shares (in shares)	148	270	148	270
Average diluted common shares (in shares)	109,130	96,368	111,084	94,588
Basic earnings per share (in dollars per share)	$ 0.54	$ 0.58	$ 1.23	$ 1.10
Diluted earnings per share (in dollars per share)	$ 0.54	$ 0.58	$ 1.22	$ 1.09