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Goodwill and Other Intangible Assets - Summary of gross carrying amounts (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Other intangible assets      
Gross carrying amount $ 258,654   $ 258,554
Accumulated amortization (104,793)   (95,962)
Net carrying amount 153,861   162,592
Amortization expense 9,164 $ 3,007  
Estimated amortization expense for other intangibles for each of the next five quarters      
June 30,2021 8,613    
September 30,2021 8,201    
December 31,2021 8,200    
March 31,2022 7,931    
June 30,2022 7,666    
Thereafter 113,250    
Net carrying amount $ 153,861   $ 162,592
Minimum      
Other intangible assets      
Estimated useful lives 2 years    
Maximum      
Other intangible assets      
Estimated useful lives 15 years