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Other Intangible Assets - Schedule of estimated future amortization (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]        
2020 $ 4,467      
2021 4,458      
2022 4,458      
2023 4,458      
2024 4,467      
Thereafter 15,999      
Carrying amount: 29,507 $ 44,231    
Other Intangible Assets        
Finite-Lived Intangible Assets [Line Items]        
2020 11,074      
2021 4,449      
2022 1,485      
2023 1,485      
2024 1,485      
Thereafter 9,529      
Carrying amount: $ 29,507 $ 44,231 $ 58,955 $ 80,734