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Prepaid Expenses and Other Current Assets
 12 Months Ended
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Prepaid Expenses and Other Current Assets Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consisted of the following as of December 31, 2020 and 2019 (in thousands):

December 31, 2020December 31, 2019
Prepaid income taxes$30,682 $26,143 
Prepaid sales and other taxes24,034 16,213 
Prepaid equipment and software maintenance15,526 18,114 
Deferred commissions54,516 45,009 
Other prepaid expenses26,187 19,593 
Other current assets20,461 17,604 
Total$171,406 $142,676 

Incremental Costs to Obtain a Contract with a Customer

The following table summarizes the deferred costs associated with obtaining customer contracts, specifically commission and incentive payments, as of December 31, 2020 and 2019 (in thousands):

December 31, 2020December 31, 2019
Deferred costs included in prepaid and other current assets$54,516 $45,009 
Deferred costs included in other assets23,200 25,698 
Total deferred costs$77,716 $70,707 

During the years ended December 31, 2020, 2019 and 2018, the Company recognized $61.7 million, $44.3 million and $45.0 million, respectively, of amortization expense related to deferred commissions.