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Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Net [Abstract]    
Amortized intangible assets, Gross Carrying Value $ 91,153 $ 93,641
Amortized intangible assets, Accumulated Amortization (40,319) (31,320)
Amortized intangible assets, Net Carrying Value 50,834 62,321
Other intangible assets, Gross Carrying Value 91,613 94,101
Other intangible assets, Net Carrying Value $ 51,294 62,781
Customer contracts and relationships    
Finite-Lived Intangible Assets, Net [Abstract]    
Amortized intangible assets, Useful Life (Years) 7 years 7 months 6 days  
Amortized intangible assets, Gross Carrying Value $ 67,729 68,798
Amortized intangible assets, Accumulated Amortization (31,201) (23,696)
Amortized intangible assets, Net Carrying Value $ 36,528 45,102
Operating contracts and licenses    
Finite-Lived Intangible Assets, Net [Abstract]    
Amortized intangible assets, Useful Life (Years) 25 years 6 months  
Amortized intangible assets, Gross Carrying Value $ 9,180 9,951
Amortized intangible assets, Accumulated Amortization (1,376) (1,094)
Amortized intangible assets, Net Carrying Value $ 7,804 8,857
Tradenames    
Finite-Lived Intangible Assets, Net [Abstract]    
Amortized intangible assets, Useful Life (Years) 6 years 2 months 12 days  
Amortized intangible assets, Gross Carrying Value $ 7,705 8,633
Amortized intangible assets, Accumulated Amortization (3,109) (2,873)
Amortized intangible assets, Net Carrying Value $ 4,596 5,760
Non-compete agreements    
Finite-Lived Intangible Assets, Net [Abstract]    
Amortized intangible assets, Useful Life (Years) 1 year 7 months 6 days  
Amortized intangible assets, Gross Carrying Value $ 5,174 5,363
Amortized intangible assets, Accumulated Amortization (4,080) (3,007)
Amortized intangible assets, Net Carrying Value $ 1,094 2,356
Other    
Finite-Lived Intangible Assets, Net [Abstract]    
Amortized intangible assets, Useful Life (Years) 8 years  
Amortized intangible assets, Gross Carrying Value $ 1,365 896
Amortized intangible assets, Accumulated Amortization (553) (650)
Amortized intangible assets, Net Carrying Value 812 246
Business licenses    
Finite-Lived Intangible Assets, Net [Abstract]    
Indefinite-lived intangible assets, Gross Carrying Value $ 460 $ 460