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Significant Accounting Policies Self-Insurance Health Insurance (Details) - Health Liability Insurance [Member]
$ in Thousands
Dec. 31, 2018
USD ($)
Stop-Loss Insurance limit per claim [Member]  
Liability for Claims and Claims Adjustment Expense [Line Items]  
Self Insurance Reserve $ 300
Stop Loss Deductible [Member]  
Liability for Claims and Claims Adjustment Expense [Line Items]  
Self Insurance Reserve $ 75