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Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets, Net [Abstract]    
Intangible assets subject to amortization, Gross Carrying Value $ 102,442 $ 91,153
Intangible assets subject to amortization, Accumulated Amortization (45,543) (40,319)
Intangible assets subject to amortization, Net Carrying Value 56,899 50,834
Other intangible assets, Gross Carrying Value 102,902 91,613
Other intangible assets, Net Carrying Value $ 57,359 51,294
Customer contracts and relationships    
Finite-Lived Intangible Assets, Net [Abstract]    
Intangible assets subject to amortization, Useful Life (Years) 7 years 8 months 12 days  
Intangible assets subject to amortization, Gross Carrying Value $ 75,255 67,729
Intangible assets subject to amortization, Accumulated Amortization (35,060) (31,201)
Intangible assets subject to amortization, Net Carrying Value $ 40,195 36,528
Operating contracts and licenses    
Finite-Lived Intangible Assets, Net [Abstract]    
Intangible assets subject to amortization, Useful Life (Years) 23 years 8 months 12 days  
Intangible assets subject to amortization, Gross Carrying Value $ 9,564 9,180
Intangible assets subject to amortization, Accumulated Amortization (1,593) (1,376)
Intangible assets subject to amortization, Net Carrying Value $ 7,971 7,804
Tradenames    
Finite-Lived Intangible Assets, Net [Abstract]    
Intangible assets subject to amortization, Useful Life (Years) 7 years 1 month 6 days  
Intangible assets subject to amortization, Gross Carrying Value $ 9,736 7,705
Intangible assets subject to amortization, Accumulated Amortization (3,524) (3,109)
Intangible assets subject to amortization, Net Carrying Value $ 6,212 4,596
Non-compete agreements    
Finite-Lived Intangible Assets, Net [Abstract]    
Intangible assets subject to amortization, Useful Life (Years) 1 year 10 months 24 days  
Intangible assets subject to amortization, Gross Carrying Value $ 5,198 5,174
Intangible assets subject to amortization, Accumulated Amortization (4,707) (4,080)
Intangible assets subject to amortization, Net Carrying Value $ 491 1,094
Other    
Finite-Lived Intangible Assets, Net [Abstract]    
Intangible assets subject to amortization, Useful Life (Years) 8 years  
Intangible assets subject to amortization, Gross Carrying Value $ 2,689 1,365
Intangible assets subject to amortization, Accumulated Amortization (659) (553)
Intangible assets subject to amortization, Net Carrying Value 2,030 812
Business licenses    
Finite-Lived Intangible Assets, Net [Abstract]    
Indefinite-lived intangible assets, Gross Carrying Value $ 460 $ 460