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Intangibles (Estimated future amortization expense) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 21,176  
2020 21,176  
2021 21,176  
2022 21,176  
2023 21,176  
Thereafter 156,061  
Finite-lived intangible assets $ 261,941 $ 286,812