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Goodwill and Other Intangible Assets Intangible Assets Amortization (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 33,233 $ 33,152  
Accumulated Amortization (21,056) (10,311)  
Net Carrying Amount 12,177 22,841  
Amortization expenses of intangible assets $ 10,700 5,200 $ 1,800
Weighted average amortization period remaining, in years 1 year 3 months 18 days    
Customer Relationships [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 24,533 24,452  
Accumulated Amortization (15,256) (8,861)  
Net Carrying Amount $ 9,277 15,591  
Weighted average amortization period remaining, in years 1 year 6 months    
Executive non-compete agreements      
Acquired Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 8,700 8,700  
Accumulated Amortization (5,800) (1,450)  
Net Carrying Amount $ 2,900 $ 7,250  
Weighted average amortization period remaining, in years 4 months 24 days