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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Other intangible assets          
Gross carrying amount $ 119,501 $ 121,736 $ 119,501 $ 121,736 $ 121,736
Accumulated amortization (66,418) (55,299) (66,418) (55,299) (58,836)
Net carrying amount 53,083 66,437 53,083 66,437 62,900
Amortization expense 3,268 3,537 9,817 10,672  
Estimated amortization expense for other intangibles for each of the next five quarters          
December 31, 2019 3,267   3,267    
March 31, 2020 3,007   3,007    
June 30, 2020 2,995   2,995    
September 30, 2020 2,945   2,945    
December 31, 2020 2,921   2,921    
Thereafter 37,948   37,948    
Net carrying amount $ 53,083 $ 66,437 $ 53,083 $ 66,437 $ 62,900
Minimum          
Other intangible assets          
Estimated useful lives     2 years    
Maximum          
Other intangible assets          
Estimated useful lives     15 years