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Goodwill and Intangible Assets Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Intangible Amortization Expense, Next Twelve Months $ 700  
Intangible Amortization Expense, Year Two 700  
Intangible Amortization Expense, Year Three 700  
Intangible Amortization Expense, Year Four 700  
Intangible Amortization Expense, Year Five 700  
Customer relationships, Accumulated amortization (1,484) $ (753)
Intangible assets [Abstract]    
Intangible Assets, Gross (Excluding Goodwill) 16,550 16,300
Intangible Assets, Net (Excluding Goodwill) 15,066 15,547
Trade names and trademarks [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Trade names and trademarks, Gross carrying amount $ 8,900 8,900
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 11 years  
Finite-Lived Intangible Assets, Gross $ 7,650 7,400
Customer relationships, Accumulated amortization (1,484) (753)
Finite-Lived Intangible Assets, Net $ 6,166 $ 6,647