Intangible Assets, Net Estimated Useful Lives of Intangible Assets (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value as of Acquisition Date	$ 171,117
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
Trademarks and Trade Names
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 Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value as of Acquisition Date	$ 9,617
Weighted Average Estimated Useful Life in Years	1 year