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Goodwill and Other Intangible Assets - Intangible Assets Amortization (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 34,153 $ 33,233  
Accumulated Amortization (27,655) (21,056)  
Net Carrying Amount 6,498 12,177  
Amortization expenses of intangible assets 6,600 10,700 $ 5,200
Customer relationships      
Acquired Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 25,453 24,533  
Accumulated Amortization (18,955) (15,256)  
Net Carrying Amount $ 6,498 9,277  
Weighted average amortization period remaining, in years 1 year 4 months 24 days    
Executive non-compete agreements      
Acquired Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 8,700 8,700  
Accumulated Amortization (8,700) (5,800)  
Net Carrying Amount $ 0 $ 2,900