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Accounts Receivable (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Accounts Receivable Additional Disclosures [Abstract] |  |
Accounts Receivable, Net, Current | $ 12,731 | $ 10,015
Unbilled accounts receivable | 448,088 | 385,567
Other Receivables | 4,960 | 5,041
Accounts receivable, net | 465,779 | 400,623
Allowance for Doubtful Accounts Receivable, Current | $ 900 | 1,000
Accounts receivable, due date prior to applicable payroll date | 1 day |
Unbilled accounts receivable [Abstract] |  |
Accrued worksite employee payroll cost | $ 401,859 | 329,979
Unbilled revenues | 105,841 | 89,765
Client Prepayments Included in Cash Balance | (59,612) | (34,177)
Unbilled accounts receivable | $ 448,088 | $ 385,567

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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