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Goodwill and Other Intangible Assets - Summary of gross carrying amounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other intangible assets      
Gross carrying amount $ 258,554 $ 119,501  
Accumulated amortization (95,962) (69,685)  
Net carrying amount 162,592 49,816  
Amortization expense 26,992 13,084 $ 14,209
Estimated amortization expense for other intangibles for each of the next five years      
2021 33,845    
2022 30,056    
2023 24,634    
2024 19,790    
2025 16,480    
Thereafter 37,787    
Net carrying amount $ 162,592 $ 49,816  
Minimum      
Other intangible assets      
Estimated useful lives 2 years    
Maximum      
Other intangible assets      
Estimated useful lives 15 years