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Leases (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Components of Lease Expense The components of lease expense for the years ended December 31, 2020 and 2019 were as follows:
20202019
Operating lease cost$10,672 $10,805 
Finance lease cost:
     Amortization of right-of-use assets1,755 2,686 
     Interest on lease liabilities294 671 
Short-term lease cost13,187 13,756 
Variable lease cost109 92 
Total lease cost$26,017 $28,010 

    Supplemental cash flow information for the years ended December 31, 2020 and 2019 related to leases were as follows:
20202019
Cash paid for amounts included in the measurement of lease liabilities:
     Operating cash flows from operating leases$23,996 $24,526 
     Operating cash flows from finance leases294 671 
     Financing cash flows from finance leases3,701 5,517 
Right-of-use assets obtained in exchange for lease obligations:
     Operating leases$7,779 $9,122 
     Finance leases83 1,309 
Schedule of Supplemental Balance Sheet Information Supplemental balance sheet information related to leases was as follows:
20202019
Operating Leases
Operating lease right-of-use assets$22,260 $23,901 
Current portion of operating lease liabilities included in "Other accrued liabilities"$7,529 $7,722 
Operating lease liabilities15,181 16,656 
     Total operating lease liabilities$22,710 $24,378 
Finance Leases
Property, plant and equipment, at cost$10,352 $15,367 
Accumulated depreciation(3,703)(3,941)
     Property, plant and equipment, net$6,649 $11,426 
Current installments of finance lease obligations$2,707 $6,758 
Finance lease obligations289 717 
     Total finance lease obligations$2,996 $7,475 
Weighted Average Remaining Lease Term (years)
     Operating leases5.876.26
     Finance leases1.390.97
Weighted Average Discount Rate
     Operating leases5.04 %5.27 %
     Finance leases6.04 %6.83 %
Schedule of Future Minimum Lease Obligations, Finance Lease The Partnership’s future minimum lease obligations as of December 31, 2020 consist of the following:
Operating LeasesFinance Leases
Year 1$8,445 $2,733 
Year 26,016 289 
Year 33,250 9 
Year 41,727 — 
Year 51,111 — 
Thereafter5,830 — 
     Total26,379 3,031 
     Less amounts representing interest costs(3,669)(35)
Total lease liability$22,710 $2,996 
Schedule of Future Minimum Obligations, Operating Leases The Partnership’s future minimum lease obligations as of December 31, 2020 consist of the following:
Operating LeasesFinance Leases
Year 1$8,445 $2,733 
Year 26,016 289 
Year 33,250 9 
Year 41,727 — 
Year 51,111 — 
Thereafter5,830 — 
     Total26,379 3,031 
     Less amounts representing interest costs(3,669)(35)
Total lease liability$22,710 $2,996