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Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2022
Accounting Policies [Abstract]  
Cash and Cash Equivalents Our cash and cash equivalents balances comprise the following:
 March 31, 2022December 31, 2021
(in thousands, except percentages)Amount% of TotalAmount% of Total
Cash accounts$572,768 87.1 $580,047 86.9 
Money market funds84,653 12.9 87,620 13.1 
Total$657,421 $667,667