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Other Intangible Assets - Expected Amortization (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Estimated amortization of intangible assets    
2020 $ 1,651  
2021 1,641  
2022 1,641  
2023 1,641  
2024 1,641  
Thereafter 6,326  
Total finite-lived intangible assets $ 14,541 $ 16,206