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LEASES
 12 Months Ended
Dec. 31, 2021
LEASES
2. LEASES
The components of operating lease expense were as follows:
 
Years Ended December 31,
  
2021
 
  
2020
 
  
2019
 
Lease cost
  
$
90,742
 
  
$
82,543
 
  
$
74,755
 
Short-term lease cost
  
 
9,598
 
  
 
6,317
 
  
 
9,427
 
Variable lease cost
  
 
1,868
 
  
 
942
 
  
 
707
 
Sublease income
  
 
(332
) 
  
 
(228
) 
  
 
(226
) 
 
  
 
 
 
  
 
 
 
  
 
 
 
 
  
$
101,876
 
  
$
89,574
 
  
$
84,663
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Supplemental balance sheet information related to operating leases were as follows:
 
December 31,
   
2021
    
2020
  
ROU assets
   
$
268,528
 
   $ 209,169  
Current portion of operating lease liabilities
   
$
81,928
 
   $ 70,232  
Operating lease liabilities
   
 
187,024
 
     139,527  
    
 
 
    
 
 
  
Total operating lease liabilities
   
$
268,952
 
   $ 209,759  
    
 
 
    
 
 
  
Weighted Average Remaining Lease Term (in years)
   
 
4.4 years
 
     3.5 years  
Weighted Average Discount Rate
   
 
3.29
% 
     4.00 % 
Supplemental cash flow information related to operating leases were as follows:
 
Years Ended December 31,
  
2021
 
  
2020
 
  
2019
 
Operating cash flows for the measurement of operating lease liabilities
  
$
91,063
 
  
$
80,921
 
  
$
75,357
 
Operating lease ROU assets obtained in exchange for operating lease obligations
  
$
141,198
 
  
$
59,093
 
  
$
290,422
 
At December 31, 2021, maturities of operating lease liabilities over each of the next five years and thereafter were as follows:
 
2022
    $ 89,322  
2023
      71,985  
2024
      49,245  
2025
      31,995  
2026
      19,662  
Thereafter
      26,837  
    
 
 
  
Total lease payments
      289,046  
Less imputed interest
      20,094  
    
 
 
  
Total lease liability
   
$
268,952
 
    
 
 
  
At December 31, 2021, we had additional operating leases, primarily for real property, that had not yet commenced. Such leases had estimated future minimum rental commitments of approximately $39,700. These operating leases are expected to commence in 2022 with lease terms of
5-11
years. These undiscounted amounts are not included in the table above.