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Goodwill and Other Intangible Assets - Change in Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Roll Forward]      
Balance at the beginning of the period $ 240,939 $ 240,939 $ 119,029
Additions as a result of acquisitions 0 0 121,910
Balance at the end of the period $ 240,939 $ 240,939 $ 240,939