Goodwill and Other Intangible Assets - Roll Forward of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Balance at beginning of year	$ 371,621	$ 287,446
Additions	1,803	84,175
Balance at End of Year	$ 373,424	$ 371,621