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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Other intangible assets          
Gross carrying amount $ 129,770 $ 100,274 $ 129,770 $ 100,274 $ 126,449
Accumulated amortization (59,795) (47,308) (59,795) (47,308) (52,660)
Net carrying amount 69,975 52,966 69,975 52,966 $ 73,789
Amortization expense 3,722 $ 2,495 7,135 $ 5,002  
Estimated amortization expense for other intangibles for each of the next five quarters          
September 30, 2018 3,537   3,537    
December 31, 2018 3,537   3,537    
March 31, 2019 3,281   3,281    
June 30, 2019 3,269   3,269    
September 30, 2018 3,268   3,268    
Thereafter $ 53,083   $ 53,083    
Minimum          
Other intangible assets          
Estimated useful lives     2 years    
Maximum          
Other intangible assets          
Estimated useful lives     15 years