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Leases (Tables)
 12 Months Ended
Dec. 31, 2021
Leases [Abstract]  
Lease Assets and Liabilities
Total lease assets and liabilities as of December 31, 2021 and 2020 were as follows:

Lease AssetsClassification December 31, 2021December 31, 2020
Operating lease right-of-use assetsOperating lease right-of-use assets$148,198 $123,338 
Finance lease assets
Property and equipment, net1
13,797 6,642 
Total leased assets$161,995 $129,980 
Lease Liabilities ClassificationDecember 31, 2021December 31, 2020
Current:
    Operating Current portion of operating lease liabilities$47,532 $43,680 
     FinanceCurrent portion of debt and finance lease obligations4,588 1,801 
Noncurrent:
   OperatingOperating lease liabilities, less current portion 101,409 80,346 
    FinanceFinance lease obligations, less current portion 9,571 5,010 
Total leased liabilities$163,100 $130,837 
1 Finance lease assets are recorded net of accumulated depreciation of $4,822 and $2,256 as of December 31, 2021 and 2020, respectively.
Lease Costs
Total lease cost for 2021 and 2020 was as follows:
Year Ended
ClassificationDecember 31,
2021		December 31,
2020
Operating lease costOperating leases $54,561 $50,561 
Short-term lease costOperating leases14,773 8,921 
Variable lease costPurchased transportation, operating leases and other operating expenses367,779 339,148 
Sublease incomeOperating revenue(2,050)(1,628)
Finance lease cost:
Amortization of leased assetsDepreciation and amortization3,381 1,560 
Interest on leased liabilitiesInterest expense, net301 197 
Total lease cost$438,745 $398,759 
The following table summarizes the weighted-average remaining lease term and weighted average discount rate:

December 31, 2021December 31, 2020
Weighted average remaining lease term (in years):
      Operating leases4.13.7
       Finance leases 3.54.0
Weighted average discount rate:
       Operating leases2.9 %3.2 %
        Finance leases 2.6 %3.1 %

The following table summarizes the supplemental cash flow information for 2021 and 2020:

Year Ended
December 31, 2021December 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases$53,981 $50,263 
Operating cash flows from finance leases301 197 
Financing cash flows from finance leases2,423 1,446 
Right-of-use assets obtained in exchange for operating lease liabilities$74,736 $72,454 
Leased assets obtained in exchange for finance lease obligations9,673 1,927 
Aggregate Future Minimum Lease Payments Under Noncancelable Operating Leases
Future minimum lease payments under noncancelable operating and finance leases with remaining terms greater than one year as of December 31, 2021 were as follows:
Operating LeasesFinance Leases
2022$52,832 $4,902 
202339,558 4,468 
202431,029 3,545 
202520,261 1,331 
202612,371 313 
Thereafter15,745 449 
Total minimum lease payments171,796 15,008 
Less: imputed interest(22,855)(849)
Present value of future minimum lease payments148,941 14,159 
Less: current portion of lease obligations(47,532)(4,588)
Long-term lease obligations$101,409 $9,571 
Aggregate Future Minimum Lease Payments Under Noncancelable Finance Leases
Future minimum lease payments under noncancelable operating and finance leases with remaining terms greater than one year as of December 31, 2021 were as follows:
Operating LeasesFinance Leases
2022$52,832 $4,902 
202339,558 4,468 
202431,029 3,545 
202520,261 1,331 
202612,371 313 
Thereafter15,745 449 
Total minimum lease payments171,796 15,008 
Less: imputed interest(22,855)(849)
Present value of future minimum lease payments148,941 14,159 
Less: current portion of lease obligations(47,532)(4,588)
Long-term lease obligations$101,409 $9,571