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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Other intangible assets          
Gross carrying amount $ 258,162 $ 119,501 $ 258,162 $ 119,501 $ 119,501
Accumulated amortization (86,525) (66,418) (86,525) (66,418) (69,685)
Net carrying amount 171,637 53,083 171,637 53,083 49,816
Amortization expense 9,560 3,268 17,232 9,817  
Estimated amortization expense for other intangibles for each of the next five quarters          
December 31, 2020 9,437   9,437    
March 31, 2021 8,831   8,831    
June 30, 2021 8,613   8,613    
September 30, 2021 8,201   8,201    
December 31, 2021 8,200   8,200    
Thereafter 128,355   128,355    
Net carrying amount $ 171,637 $ 53,083 $ 171,637 $ 53,083 $ 49,816
Minimum          
Other intangible assets          
Estimated useful lives     2 years    
Maximum          
Other intangible assets          
Estimated useful lives     15 years