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Goodwill and Other Intangible Assets - Summary of gross carrying amounts (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Other intangible assets          
Gross carrying amount $ 258,190   $ 258,190   $ 258,554
Accumulated amortization (121,606)   (121,606)   (95,962)
Net carrying amount 136,584   136,584   162,592
Amortization expense 8,543 $ 9,560 26,675 $ 17,232  
Estimated amortization expense for other intangibles for each of the next five quarters          
December 31, 2021 8,201   8,201    
March 31, 2022 7,931   7,931    
June 30, 2022 7,666   7,666    
September 30, 2022 7,230   7,230    
December 31, 2022 7,229   7,229    
Thereafter 98,327   98,327    
Net carrying amount $ 136,584   $ 136,584   $ 162,592
Minimum          
Other intangible assets          
Estimated useful lives     2 years    
Maximum          
Other intangible assets          
Estimated useful lives     15 years