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Goodwill and other intangible assets - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Goodwill and other intangible assets          
Amortization Of Intangible Assets $ 2,371,000 $ 2,324,000 $ 4,683,000 $ 4,649,000  
Trademark recognized 6,100,000   6,100,000   $ 6,100,000
Changes in the carrying amount of goodwill $ 0 $ 0 $ 0 $ 0