Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Net income available to common stockholders	$ 271,109	$ 254,852	$ 237,828
Average common shares outstanding (in shares)	109,577	109,860	98,351
Average potential dilutive common shares (in shares)	621	313	446
Average diluted common shares (in shares)	110,198	110,173	98,797
Basic earnings per share (in dollars per share)	$ 2.47	$ 2.32	$ 2.42
Diluted earnings per share (in dollars per share)	$ 2.46	$ 2.31	$ 2.41