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Other Receivables and Current Assets and Other Accrued Expenses and Liabilities
 6 Months Ended
Jun. 30, 2021
Other Receivables and Current Assets and Other Accrued Expenses and Liabilities [Abstract]  
Other Receivables and Current Assets and Other Accrued Expenses and Liabilities Other Receivables and Current Assets and Other Accrued Expenses and Liabilities
Our other receivables and current assets and other accrued expenses and liabilities comprise the following balances:
(in thousands)June 30,
2021		December 31,
2020
Receivables related to unrecognized revenue$113,354 $192,154 
Income taxes receivable, including overpayments and refunds45,879 31,628 
Prepaid expenses and other current assets55,259 44,740 
Total other receivables and current assets$214,492 $268,522 
Accrued vacation41,656 34,132 
Consumption, VAT and sales tax liabilities25,321 45,156 
Accrued expenses and other current liabilities119,568 120,178 
Total other accrued expenses and liabilities$186,545 $199,466 

Receivables related to unrecognized revenue represent the current portion of billings made for customer contracts that have not yet been recognized as revenue.