Intangible Assets, Net - Estimated Useful Life of Intangible Assets (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value as of Acquisition Date	$ 171,113
Weighted Average Estimated Useful Life in Years	19 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value as of Acquisition Date	$ 146,800
Weighted Average Estimated Useful Life in Years	20 years
Trademark and trade name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value as of Acquisition Date	$ 14,700
Weighted Average Estimated Useful Life in Years	29 years
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value as of Acquisition Date	$ 9,613
Weighted Average Estimated Useful Life in Years	1 year