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Goodwill and Other Intangible Assets - Summary of gross carrying amounts (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Other intangible assets          
Gross carrying amount $ 258,532   $ 258,532   $ 258,554
Accumulated amortization (113,406)   (113,406)   (95,962)
Net carrying amount 145,126   145,126   162,592
Amortization expense 8,968 $ 4,665 18,132 $ 7,672  
Estimated amortization expense for other intangibles for each of the next five quarters          
September 30,2021 8,201   8,201    
December 31,2022 8,200   8,200    
March 31,2022 7,931   7,931    
June 30,2022 7,666   7,666    
September 30,2022 7,230   7,230    
Thereafter 105,898   105,898    
Net carrying amount $ 145,126   $ 145,126   $ 162,592
Minimum          
Other intangible assets          
Estimated useful lives     2 years    
Maximum          
Other intangible assets          
Estimated useful lives     15 years