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Leases (Tables)
 9 Months Ended
Sep. 30, 2020
Leases [Abstract]  
Components of Lease Expense The components of lease expense for the nine months ended September 30, 2020 and 2019 were as follows:
Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
Operating lease cost$2,572 $2,704 $8,182 $8,085 
Finance lease cost:
     Amortization of right-of-use assets$390 688 $1,505 1,998 
     Interest on lease liabilities$62 164 $258 532 
Short-term lease cost$3,138 5,420 $10,054 10,642 
Variable lease cost$33 $30 $83 $80 
Total lease cost$6,195 $9,006 $20,082 $21,337 
Schedule of Supplemental Balance Sheet Information
Supplemental balance sheet information related to leases at September 30, 2020 and December 31, 2019 was as follows:
September 30,
2020		December 31, 2019
Operating Leases
Operating lease right-of-use assets$23,201 $23,901 
Current portion of operating lease liabilities included in "Other accrued liabilities"$7,645 $7,722 
Operating lease liabilities$16,005 16,656 
     Total operating lease liabilities$23,650 $24,378 
Finance Leases
Property, plant and equipment, at cost$10,352 $15,367 
Accumulated depreciation$(3,453)(3,941)
     Property, plant and equipment, net$6,899 $11,426 
Current installments of finance lease obligations$3,189 $6,758 
Finance lease obligations$348 717 
     Total finance lease obligations$3,537 $7,475 
Schedule of Future Minimum Lease Obligations, Finance Lease The Partnership’s future minimum lease obligations as of September 30, 2020 consist of the following:
Operating LeasesFinance Leases
Year 1$8,603 $3,246 
Year 26,309 252 
Year 33,666 109 
Year 41,717 — 
Year 51,128 — 
Thereafter6,069 — 
     Total$27,492 $3,607 
     Less amounts representing interest costs(3,842)(70)
Total lease liability$23,650 $3,537 
Schedule of Future Minimum Lease Obligations, Operating Leases The Partnership’s future minimum lease obligations as of September 30, 2020 consist of the following:
Operating LeasesFinance Leases
Year 1$8,603 $3,246 
Year 26,309 252 
Year 33,666 109 
Year 41,717 — 
Year 51,128 — 
Thereafter6,069 — 
     Total$27,492 $3,607 
     Less amounts representing interest costs(3,842)(70)
Total lease liability$23,650 $3,537