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Leases (Tables)
 3 Months Ended
Mar. 31, 2021
Leases [Abstract]  
Components of Lease Expense
Lease expense is charged to selling, general and administrative expenses. Components of lease expense were as follows (in thousands):

  
Three Months Ended March 31,
  
   
2021
    
2020
  
Operating lease cost
  
$
11,806
    
$
10,431
  
Variable lease cost
    
1,508
      
1,615
  
Total lease expense
  
$
13,314
    
$
12,046
  
Supplemental Cash Flow Information Related to Leases
Supplemental cash flow information related to leases is as follows (in thousands):

  
Three Months Ended March 31,
  
   
2021
    
2020
  
Cash paid for amounts included in the measurement of lease liabilities:
            
Operating cash flows from operating leases
  
$
13,093
    
$
9,996
  
Right-of-use assets obtained in exchange for lease obligations:
                
Operating leases
  
$
4,125
    
$
12,043