Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Basic and Diluted Earnings Per Share
Net income available to common stockholders, basic and diluted		$ 80,802	$ 43,339
Average outstanding shares - basic (in shares)		95,465,801	93,287,670
Add: dilutive restricted stock units and stock options (in shares)		81,121	72,122
Average outstanding shares - diluted (in shares)		95,546,922	93,359,792
Basic earnings per share (in dollars per share)		$ 0.85	$ 0.46
Diluted earnings per share (in dollars per share)		$ 0.85	$ 0.46
Restricted stock units and stock options excluded from the diluted average outstanding share calculation (in shares)	[1]	0	102,094

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