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Intangible Assets (Future Annual Estimated Amortization Expense) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Intangible Assets [Abstract]    
2019 $ 1,485  
2020 1,834  
2021 1,831  
2022 1,808  
2023 1,383  
Thereafter 1,120  
Intangible assets amortization, total 9,461 $ 9,982
Intangible Assets, Net (Excluding Goodwill), Total $ 803,194 $ 964,911