XML 18 R45.htm IDEA: XBRL DOCUMENT v3.19.3
Summary of Significant Accounting Policies - Insurance (Details)
 9 Months Ended
Sep. 30, 2019
USD ($)
Accounting Policies [Abstract]  
Employer's liability claims subject to deductible per occurrence $ 1,000,000.0
Worker's compensation claims per occurrence 5,000,000.0
Auto liability insurance claims deductible 10,000,000.0
General liability insurance claims deductible 10,000,000
Employee health care benefit plans subject to deductible per claimant $ 500,000