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Employee Benefit Plans and Insurance (Tables)
 12 Months Ended
Dec. 31, 2018
Insurance Claims [Member]  
Liability for Claims and Claims Adjustment Expense [Line Items]  
Schedule of Accrued Liabilities [Table Text Block]
Accrued insurance premiums and deductibles related to our estimate of the self-insured portion of costs associated with our health, workers’ compensation, general liability and auto liability insurance are as follows:
 
As of December 31,
 
2018
 
2017
Workers’ compensation
$
2,992

 
$
3,689

Health insurance
1,834

 
2,046

General liability and auto liability
656

 
1,007

 
$
5,482

 
$
6,742