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LEASES
 6 Months Ended
Jun. 30, 2020
Leases [Abstract]  
LEASES LEASES
We lease vehicles, equipment, property and other non-core equipment in the ordinary course of our business. Leases are classified as either operating leases or finance leases, as appropriate. Our leases have varying terms and may include renewal or purchase options, escalation clauses, restrictions, lease concessions, capital project funding, penalties or other obligations that we considered historically in determining minimum rental payments. We recognize lease expense for operating leases on a straight-line basis over the lease term. We recognize depreciation expense for finance leases over either the useful life of the asset or the lease term based on the terms of the lease agreement.
We are also party to three landfill operation and management agreements. These agreements are long-term landfill operating contracts with government bodies whereby we receive tipping revenue, pay normal operating expenses and assume future final capping, closure and post-closure obligations. The government body retains ownership of the landfill. There is no bargain purchase option and title to the property does not pass to us at the end of the lease term. We allocate the consideration paid to the landfill airspace rights and underlying land lease based on the relative fair values. In addition to up-front or one-time payments, the landfill operating agreements may require us to make future minimum rental payments, including success/expansion fees, other direct costs and final capping, closure and post-closure costs. The value of all future minimum rental payments is amortized and charged to cost of operations over the life of the contract. We amortize the consideration allocated to airspace rights as airspace is utilized on a units-of-consumption basis and such amortization is charged to cost of operations as airspace is consumed (e.g., as tons are placed into the landfill). The underlying value of any land lease is amortized to cost of operations on a straight-line basis over the estimated life of the operating agreement.
A schedule of lease costs and other lease information follows:
Three Months Ended
June 30,		Six Months Ended
June 30,
2020201920202019
Lease cost:
Amortization of right-of-use assets$859  $503  $1,591  $912  
Interest expense290  186  536  342  
Fixed lease cost - vehicles, equipment and property2,171  2,342  4,588  4,921  
Fixed lease cost - landfill operating leases1,795  1,975  3,468  3,623  
Fixed lease cost3,966  4,317  8,056  8,544  
Short-term lease cost729  1,092  1,658  1,750  
Variable lease cost129  35  261  42  
Total lease cost$5,973  $6,133  $12,102  $11,590  
Other information:
Cash paid for amounts included in the measurement of lease liabilities:
Financing cash flows for finance leases$981  $733  $1,942  $1,204  
Operating cash flows for operating leases$3,272  $4,831  $5,714  $6,874  
Right-of-use assets obtained in exchange for new finance lease liabilities$5,391  $4,384  $11,793  $6,857  
Right-of-use assets obtained in exchange for new operating lease liabilities$776  $173  $3,142  $588  
June 30,
2020
Weighted-average remaining lease term - finance leases (years)6.1
Weighted-average remaining lease term - operating leases (years)11.8
Weighted-average discount rate - finance leases4.6 %
Weighted-average discount rate - operating leases5.1 %

Estimated minimum future lease obligations are as follows:
Operating LeasesFinance Leases
Fiscal year ending December 31, 2020$7,512  $2,928  
Fiscal year ending December 31, 202112,145  5,706  
Fiscal year ending December 31, 20229,486  5,113  
Fiscal year ending December 31, 20237,296  4,947  
Fiscal year ending December 31, 20246,638  4,847  
Thereafter63,964  9,778  
Total lease payments107,041  33,319  
Less: interest expense(28,416) (5,056) 
Lease liability balance$78,625  $28,263  
LEASES LEASES
We lease vehicles, equipment, property and other non-core equipment in the ordinary course of our business. Leases are classified as either operating leases or finance leases, as appropriate. Our leases have varying terms and may include renewal or purchase options, escalation clauses, restrictions, lease concessions, capital project funding, penalties or other obligations that we considered historically in determining minimum rental payments. We recognize lease expense for operating leases on a straight-line basis over the lease term. We recognize depreciation expense for finance leases over either the useful life of the asset or the lease term based on the terms of the lease agreement.
We are also party to three landfill operation and management agreements. These agreements are long-term landfill operating contracts with government bodies whereby we receive tipping revenue, pay normal operating expenses and assume future final capping, closure and post-closure obligations. The government body retains ownership of the landfill. There is no bargain purchase option and title to the property does not pass to us at the end of the lease term. We allocate the consideration paid to the landfill airspace rights and underlying land lease based on the relative fair values. In addition to up-front or one-time payments, the landfill operating agreements may require us to make future minimum rental payments, including success/expansion fees, other direct costs and final capping, closure and post-closure costs. The value of all future minimum rental payments is amortized and charged to cost of operations over the life of the contract. We amortize the consideration allocated to airspace rights as airspace is utilized on a units-of-consumption basis and such amortization is charged to cost of operations as airspace is consumed (e.g., as tons are placed into the landfill). The underlying value of any land lease is amortized to cost of operations on a straight-line basis over the estimated life of the operating agreement.
A schedule of lease costs and other lease information follows:
Three Months Ended
June 30,		Six Months Ended
June 30,
2020201920202019
Lease cost:
Amortization of right-of-use assets$859  $503  $1,591  $912  
Interest expense290  186  536  342  
Fixed lease cost - vehicles, equipment and property2,171  2,342  4,588  4,921  
Fixed lease cost - landfill operating leases1,795  1,975  3,468  3,623  
Fixed lease cost3,966  4,317  8,056  8,544  
Short-term lease cost729  1,092  1,658  1,750  
Variable lease cost129  35  261  42  
Total lease cost$5,973  $6,133  $12,102  $11,590  
Other information:
Cash paid for amounts included in the measurement of lease liabilities:
Financing cash flows for finance leases$981  $733  $1,942  $1,204  
Operating cash flows for operating leases$3,272  $4,831  $5,714  $6,874  
Right-of-use assets obtained in exchange for new finance lease liabilities$5,391  $4,384  $11,793  $6,857  
Right-of-use assets obtained in exchange for new operating lease liabilities$776  $173  $3,142  $588  
June 30,
2020
Weighted-average remaining lease term - finance leases (years)6.1
Weighted-average remaining lease term - operating leases (years)11.8
Weighted-average discount rate - finance leases4.6 %
Weighted-average discount rate - operating leases5.1 %

Estimated minimum future lease obligations are as follows:
Operating LeasesFinance Leases
Fiscal year ending December 31, 2020$7,512  $2,928  
Fiscal year ending December 31, 202112,145  5,706  
Fiscal year ending December 31, 20229,486  5,113  
Fiscal year ending December 31, 20237,296  4,947  
Fiscal year ending December 31, 20246,638  4,847  
Thereafter63,964  9,778  
Total lease payments107,041  33,319  
Less: interest expense(28,416) (5,056) 
Lease liability balance$78,625  $28,263