Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets, Net [Abstract]
Amortized intangible assets, Gross Carrying Value	$ 93,513	$ 93,641
Accumulated Amortization	(36,576)	(31,320)
Amortized intangible assets, Net Carrying Value	56,937	62,321
Intangible Assets, Gross (Excluding Goodwill)	93,973	94,101
Other intangible assets, net	57,397	62,781
Customer contracts and relationships
Finite-Lived Intangible Assets, Net [Abstract]
Amortized intangible assets, Gross Carrying Value	68,454	68,798
Accumulated Amortization	(27,708)	(23,696)
Amortized intangible assets, Net Carrying Value	40,746	45,102
Operating contracts and licenses
Finite-Lived Intangible Assets, Net [Abstract]
Amortized intangible assets, Gross Carrying Value	9,530	9,951
Accumulated Amortization	(1,207)	(1,094)
Amortized intangible assets, Net Carrying Value	8,323	8,857
Tradenames
Finite-Lived Intangible Assets, Net [Abstract]
Amortized intangible assets, Gross Carrying Value	8,553	8,633
Accumulated Amortization	(3,343)	(2,873)
Amortized intangible assets, Net Carrying Value	5,210	5,760
Other
Finite-Lived Intangible Assets, Net [Abstract]
Amortized intangible assets, Gross Carrying Value	1,678	896
Accumulated Amortization	(745)	(650)
Amortized intangible assets, Net Carrying Value	933	246
Non-compete agreements
Finite-Lived Intangible Assets, Net [Abstract]
Amortized intangible assets, Gross Carrying Value	5,298	5,363
Accumulated Amortization	(3,573)	(3,007)
Amortized intangible assets, Net Carrying Value	1,725	2,356
Business licenses
Finite-Lived Intangible Assets, Net [Abstract]
Unamortized intangible assets, Gross Carrying Value	$ 460	$ 460