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Other Current Assets (Tables)
 12 Months Ended
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Current Assets
Other current assets consisted of the following (in thousands):
 December 31,
 20202019
Prepaid expenses$97,674 $84,364 
Other49,841 42,768 
Other current assets$147,515 $127,132