Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Basic and Diluted Earnings Per Share
Net income available to common stockholders, basic and diluted		$ 63,444	$ 52,392	$ 106,783	$ 101,524
Average outstanding shares - basic		95,405,493	85,826,290	94,346,582	85,191,658
Add: dilutive restricted stock units and stock options		24,910	31,996	49,348	49,580
Average outstanding shares - diluted		95,430,403	85,858,286	94,395,930	85,241,238
Basic earnings per share		$ 0.67	$ 0.61	$ 1.13	$ 1.19
Diluted earnings per share		$ 0.66	$ 0.61	$ 1.13	$ 1.19
Restricted stock units and stock options excluded from the diluted average outstanding share calculation	[1]	143,938	0	121,533	0

[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.