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Leases (Tables)
 6 Months Ended
Jun. 30, 2020
Leases [Abstract]  
Components of Lease Expense The components of lease expense for the six months ended June 30, 2020 and 2019 were as follows:
Three Months Ended June 30,Six Months Ended June 30,
2020201920202019
Operating lease cost$2,767  $2,784  $5,611  $5,381  
Finance lease cost:
     Amortization of right-of-use assets$526  688  $1,115  1,310  
     Interest on lease liabilities$86  185  $196  368  
Short-term lease cost$3,492  2,671  $6,915  5,222  
Variable lease cost$22  $22  $50  $50  
Total lease cost$6,893  $6,350  $13,887  $12,331  
Schedule of Supplemental Balance Sheet Information
Supplemental balance sheet information related to leases at June 30, 2020 and December 31, 2019 was as follows:
June 30,
2020		December 31, 2019
Operating Leases
Operating lease right-of-use assets$24,554  $23,901  
Current portion of operating lease liabilities included in "Other accrued liabilities"$7,906  $7,722  
Operating lease liabilities$17,081  16,656  
     Total operating lease liabilities$24,987  $24,378  
Finance Leases
Property, plant and equipment, at cost$11,107  $15,367  
Accumulated depreciation$(3,360) (3,941) 
     Property, plant and equipment, net$7,747  $11,426  
Current installments of finance lease obligations$3,931  $6,758  
Finance lease obligations$405  717  
     Total finance lease obligations$4,336  $7,475  
Schedule of Future Minimum Lease Obligations, Finance Lease The Partnership’s future minimum lease obligations as of June 30, 2020 consist of the following:
Operating LeasesFinance Leases
Year 1$8,964  $4,044  
Year 26,731  252  
Year 34,055  172  
Year 41,887  —  
Year 51,210  —  
Thereafter6,319  —  
     Total$29,166  $4,468  
     Less amounts representing interest costs(4,179) (132) 
Total lease liability$24,987  $4,336  
Schedule of Future Minimum Lease Obligations, Operating Leases The Partnership’s future minimum lease obligations as of June 30, 2020 consist of the following:
Operating LeasesFinance Leases
Year 1$8,964  $4,044  
Year 26,731  252  
Year 34,055  172  
Year 41,887  —  
Year 51,210  —  
Thereafter6,319  —  
     Total$29,166  $4,468  
     Less amounts representing interest costs(4,179) (132) 
Total lease liability$24,987  $4,336