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Other Receivables and Current Assets
 12 Months Ended
Dec. 31, 2017
Prepaid Expense and Other Assets, Current [Abstract]  
Other Receivables and Current Assets
Other Receivables and Current Assets
The Company's other receivables and current assets comprise the following balances:
 
December 31,
(in thousands)
2017
 
2016
Receivables related to unrecognized revenue
$
215,155

 
$
199,119

Income taxes receivable, including overpayments and refunds
21,663

 
15,718

Prepaid expenses and other current assets
27,002

 
24,512

Total other receivables and current assets
$
263,820

 
$
239,349


Receivables for unrecognized revenue represent the current portion of billings made for annual lease licenses and software maintenance that have not yet been recognized as revenue.