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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2020
Accounts Receivable Additional Disclosures [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Accounts receivable, net consisted of the following:
December 31,
(in thousands)20202019
Trade, net$6,559 $12,731 
Unbilled380,819 448,088 
Other5,368 4,960 
Accounts receivable, net$392,746 $465,779 
Unbilled accounts receivable Client prepayments directly attributable to accrued worksite employee payroll costs and unbilled revenues have been netted as we have the legal right of offset for these amounts. Unbilled accounts receivable consisted of the following:
 December 31,
(in thousands)20202019
 
Accrued worksite employee payroll cost$334,836 $401,859 
Unbilled revenues81,311 105,841 
Client prepayments(35,328)(59,612)
Unbilled accounts receivable$380,819 $448,088