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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Other intangible assets          
Gross carrying amount $ 119,501 $ 121,736 $ 119,501 $ 121,736 $ 121,736
Accumulated amortization (63,150) (51,761) (63,150) (51,761) (58,836)
Net carrying amount 56,351 69,975 56,351 69,975 62,900
Amortization expense 3,268 3,722 6,549 7,135  
Estimated amortization expense for other intangibles for each of the next five quarters          
September 30, 2019 3,268   3,268    
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    
Thereafter 40,869   40,869    
Net carrying amount $ 56,351 $ 69,975 $ 56,351 $ 69,975 $ 62,900
Minimum          
Other intangible assets          
Estimated useful lives     2 years    
Maximum          
Other intangible assets          
Estimated useful lives     15 years