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Goodwill and Other Intangible Assets Intangible Assets Amortization (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 33,152 $ 9,665  
Accumulated Amortization (10,311) (5,237)  
Net Carrying Amount 22,841 4,428  
Amortization expenses of intangible assets $ 5,241 1,799 $ 1,529
Weighted average amortization period remaining, in years 1 year 4 months 24 days    
Customer Relationships [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 24,452 9,665  
Accumulated Amortization (8,861) (5,237)  
Net Carrying Amount $ 15,591 4,428  
Weighted average amortization period remaining, in years 1 year 8 months 12 days    
Executive non-compete agreements      
Acquired Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 8,700 0  
Accumulated Amortization (1,450) 0  
Net Carrying Amount $ 7,250 $ 0  
Weighted average amortization period remaining, in years 10 months 24 days