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Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Net [Abstract]    
Intangible assets subject to amortization, Gross Carrying Value $ 93,694 $ 93,641
Intangible assets subject to amortization, Accumulated Amortization (39,449) (31,320)
Intangible assets subject to amortization, Net Carrying Value 54,245 62,321
Other intangible assets, Gross Carrying Value 94,154 94,101
Other intangible assets, Net Carrying Value $ 54,705 62,781
Customer contracts and relationships    
Finite-Lived Intangible Assets, Net [Abstract]    
Intangible assets subject to amortization, Useful Life (Years) 7 years 10 months 24 days  
Intangible assets subject to amortization, Gross Carrying Value $ 68,386 68,798
Intangible assets subject to amortization, Accumulated Amortization (29,747) (23,696)
Intangible assets subject to amortization, Net Carrying Value $ 38,639 45,102
Operating contracts and licenses    
Finite-Lived Intangible Assets, Net [Abstract]    
Intangible assets subject to amortization, Useful Life (Years) 25 years 8 months 12 days  
Intangible assets subject to amortization, Gross Carrying Value $ 9,703 9,951
Intangible assets subject to amortization, Accumulated Amortization (1,434) (1,094)
Intangible assets subject to amortization, Net Carrying Value $ 8,269 8,857
Tradenames    
Finite-Lived Intangible Assets, Net [Abstract]    
Intangible assets subject to amortization, Useful Life (Years) 6 years 4 months 24 days  
Intangible assets subject to amortization, Gross Carrying Value $ 8,620 8,633
Intangible assets subject to amortization, Accumulated Amortization (3,612) (2,873)
Intangible assets subject to amortization, Net Carrying Value $ 5,008 5,760
Non-compete agreements    
Finite-Lived Intangible Assets, Net [Abstract]    
Intangible assets subject to amortization, Useful Life (Years) 1 year 8 months 12 days  
Intangible assets subject to amortization, Gross Carrying Value $ 5,294 5,363
Intangible assets subject to amortization, Accumulated Amortization (3,868) (3,007)
Intangible assets subject to amortization, Net Carrying Value $ 1,426 2,356
Other    
Finite-Lived Intangible Assets, Net [Abstract]    
Intangible assets subject to amortization, Useful Life (Years) 8 years 1 month 6 days  
Intangible assets subject to amortization, Gross Carrying Value $ 1,691 896
Intangible assets subject to amortization, Accumulated Amortization (788) (650)
Intangible assets subject to amortization, Net Carrying Value 903 246
Business licenses    
Finite-Lived Intangible Assets, Net [Abstract]    
Indefinite-lived intangible assets, Gross Carrying Value $ 460 $ 460