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Intangible Assets (Future Annual Estimated Amortization Expense) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Intangible Assets [Abstract]    
Remainder of 2018 $ 386  
2019 626  
2020 439  
2021 436  
2022 413  
Thereafter 1,450  
Intangible assets amortization, total 3,750 $ 4,493
Net Carrying Amount, Intangible Assets $ 983,393 $ 995,170