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Leases (Tables)
 9 Months Ended
Sep. 30, 2021
Leases [Abstract]  
Lease, Cost
The following table provides the components of lease expense for the periods indicated (in thousands):

Three Months EndedNine Months Ended
September 30,September 30,
2021202020212020
Finance lease cost:
Amortization of ROU assets$1,184 $622 $3,534 $1,728 
Interest on lease liabilities101 70 321 212 
Operating lease cost643 681 1,890 2,038 
Short-term lease cost3,701 3,085 10,399 7,756 
Variable lease cost2 — 4 — 
Total lease expense$5,631 $4,458 $16,148 $11,734 

The following table provides supplemental cash flow and other information related to leases for the periods indicated (in thousands):
Nine Months Ended
September 30,
20212020
Cash paid for amounts included in measurement of lease liabilities:
Operating cash flows from operating leases (1)
$1,886 $2,037 
Operating cash flows from finance leases260 295 
Financing cash flows from finance leases3,240 1,677 
ROU assets obtained in exchange for new lease liabilities:
Finance leases2,083 1,655 
Operating leases1,157 630 
______________
(1)Amounts are included in Other operating activities on the unaudited condensed consolidated statements of cash flows.

The following table provides the lease terms and discount rates for the periods indicated:

Nine Months Ended
September 30,
20212020
Weighted-average remaining lease term (years):
Finance leases3.753.18
Operating leases4.064.46
Weighted-average discount rate:
Finance leases2.7%4.3%
Operating leases3.8%4.4%
Assets and Liabilities, Lessee
The following table provides supplemental balance sheet information related to leases at the dates indicated (in thousands):
September 30,December 31,
20212020
Assets
Finance lease ROU assets (1)
$13,800 $15,251 
Operating lease ROU assets7,551 8,051 
Liabilities
Current
Finance lease liabilities4,028 4,112 
Operating lease liabilities2,201 2,050 
Noncurrent
Finance lease liabilities10,434 11,507 
Operating lease liabilities5,353 6,000 
______________
(1)Amounts are included in Property and equipment, net on the unaudited condensed consolidated balance sheets.
Lessee, Operating Lease, Liability, Maturity
The following table provides maturities of undiscounted lease liabilities at September 30, 2021 (in thousands):

Finance Operating
LeaseLease
Remainder of 2021$1,219 $657 
20223,941 2,343 
20233,143 2,022 
20242,348 1,874 
20253,771 394 
Thereafter801 788 
Total lease payments15,223 8,078 
Less: Interest(761)(524)
Present value of lease liabilities14,462 7,554 
Less: Current portion of lease obligation(4,028)(2,201)
Total long-term lease obligation$10,434 $5,353 
The following table provides maturities of undiscounted lease liabilities at December 31, 2020 (in thousands):
Finance Operating
LeaseLease
2021$4,496 $2,343 
20223,562 2,002 
20232,764 1,821 
20241,969 1,700 
20252,992 222 
Thereafter802 675 
Total lease payments16,585 8,763 
Less: Interest(966)(713)
Present value of lease liabilities15,619 8,050 
Less: Current portion of lease obligation(4,112)(2,050)
Total long-term lease obligation$11,507 $6,000 
Finance Lease, Liability, Maturity
The following table provides maturities of undiscounted lease liabilities at September 30, 2021 (in thousands):

Finance Operating
LeaseLease
Remainder of 2021$1,219 $657 
20223,941 2,343 
20233,143 2,022 
20242,348 1,874 
20253,771 394 
Thereafter801 788 
Total lease payments15,223 8,078 
Less: Interest(761)(524)
Present value of lease liabilities14,462 7,554 
Less: Current portion of lease obligation(4,028)(2,201)
Total long-term lease obligation$10,434 $5,353 
The following table provides maturities of undiscounted lease liabilities at December 31, 2020 (in thousands):
Finance Operating
LeaseLease
2021$4,496 $2,343 
20223,562 2,002 
20232,764 1,821 
20241,969 1,700 
20252,992 222 
Thereafter802 675 
Total lease payments16,585 8,763 
Less: Interest(966)(713)
Present value of lease liabilities15,619 8,050 
Less: Current portion of lease obligation(4,112)(2,050)
Total long-term lease obligation$11,507 $6,000