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Goodwill and Other Intangible Assets - Intangible Assets Amortization (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 25,899 $ 34,153  
Accumulated Amortization (21,681) (27,655)  
Net Carrying Amount 4,218 6,498  
Amortization expenses of intangible assets 2,900 6,600 $ 10,700
Customer relationships      
Acquired Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount 25,899 25,453  
Accumulated Amortization (21,681) (18,955)  
Net Carrying Amount $ 4,218 6,498  
Weighted average amortization period remaining, in years 1 year 1 month 6 days    
Executive non-compete agreements      
Acquired Finite-Lived Intangible Assets [Line Items]      
Gross Carrying Amount $ 0 8,700  
Accumulated Amortization 0 (8,700)  
Net Carrying Amount $ 0 $ 0