Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Basic and Diluted Earnings Per Share
Net income available to common stockholders, basic and diluted		$ 77,757	$ 51,610	$ 184,540	$ 153,134
Average outstanding shares - basic (in shares)		95,411,656	90,294,811	94,704,198	86,911,402
Add: dilutive restricted stock units and stock options (in shares)		30,920	154,384	43,696	170,776
Average outstanding shares - diluted (in shares)		95,442,576	90,449,195	94,747,894	87,082,178
Basic earnings per share (in dollars per share)		$ 0.81	$ 0.57	$ 1.95	$ 1.76
Diluted earnings per share (in dollars per share)		$ 0.81	$ 0.57	$ 1.95	$ 1.76
Restricted stock units and stock options excluded from the diluted average outstanding share calculation (in shares)	[1]	93,253	4,037	78,605	1,360

[1] Anti-dilution occurs when the unrecognized compensation cost per share of a restricted stock unit or the exercise price of a stock option exceeds the market price of the Company’s stock.