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Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense $ 29,722 $ 35,559 $ 35,124
Annual amortization expense in 2019 20,411    
Annual amortization expense in 2020 17,308    
Annual amortization expense in 2021 12,859    
Annual amortization expense in 2022 7,493    
Annual amortization expense in 2023 $ 2,526