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Goodwill and Intangible Assets Estimated Future Amortization Expense Related to Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 7,801  
2019 7,801  
2020 3,246  
2021 2,917  
2022 2,217  
Finite-Lived Intangible Assets, Amortization Expense, after Year Five 8,560  
Net Balance $ 32,542 $ 40,485