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Other Intangible Assets, Annual Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Annual Estimated Future Amortization Expense [Abstract]      
2021 $ 11,227    
2022 10,090    
2023 9,495    
2024 8,512    
2025 7,420    
Impairment Charges [Abstract]      
Indefinite life intangible assets impairment charge $ 0 $ 0 $ 0