Employee Benefit Plans and Insurance (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) $ / employees	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Discretionary Contribution Amount | $	$ 4.6	$ 3.1	$ 0.3
Self Insurance Program, Major Medical and Hospitialization, Liability per Employee or Dependent per Year, Maximum	200,000
Self Insurance Program, Workers' Compensation Coverage per Incident, Maximum	500,000
Self Insurance Program, General Liability Insurance, Deductible per Occurrence	250,000
Self Insurance Program, Auto Liability Insurance, Deductible per Occurrence	250,000