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Leases (Tables)
 9 Months Ended
Sep. 30, 2020
Leases [Abstract]  
Components of Lease Expense and Supplemental Cash Flow and Additional Information he components of lease expense were as follows:
Three Months EndedNine Months Ended
September 30September 30
(In thousands)2020201920202019
Finance leases:
Amortization expense$377 $325 $1,115 $911 
Interest on lease liabilities43 27 139 68 
Operating leases8,558 4,391 21,745 11,518 
Variable and short-term lease expense11,572 6,759 29,169 16,367 
Sublease income(51)— (150)— 
Total lease expense from continuing operations$20,499 $11,502 $52,018 $28,864 

Supplemental cash flow information related to leases was as follows:
Nine Months Ended
September 30
(In thousands)20202019
Cash paid for amounts included in the measurement of lease liabilities:
Cash flows from operating activities - Operating leases$20,512 $10,881 
Cash flows from financing activities - Finance leases997 953 
ROU assets obtained in exchange for lease obligations:
Operating leases (a)
$62,507 $57,607 
Finance leases1,613 1,671 
(a)     Cash flows for the nine months ended September 30, 2020 include ROU assets of approximately $56 million that were recorded upon the acquisition of ESOL. Cash flows for nine months ended September 30, 2019 include ROU assets of approximately $34 million that were recorded upon adoption at January 1, 2019 and approximately $21 million that were recorded upon the acquisition of Clean Earth. See Note 3, Acquisitions and Dispositions, for additional information..
Supplemental additional information related to leases was as follows:
September 30
2020		December 31
2019
Other information:
    Weighted average remaining lease term - Operating leases (in years)8.1011.57
    Weighted average remaining lease term - Finance leases (in years)3.734.01
    Weighted average discount rate - Operating leases6.1 %6.3 %
    Weighted average discount rate - Finance leases4.1 %4.2 %
Supplemental Balance Sheet Information Related to Leases
Supplemental balance sheet information related to leases was as follows: 
(In thousands)September 30
2020		December 31
2019
Operating Leases:
     Operating lease ROU assets$96,800 $52,065 
     Current portion of operating lease liabilities26,577 $12,544 
     Operating lease liabilities67,995 36,974 
Finance Leases:
  Property, plant and equipment, net$4,179 $3,519 
     Current maturities of long-term debt1,335 $1,237 
     Long-term debt2,903 2,218 
Maturities of Operating Lease Liabilities
Maturities of lease liabilities were as follows:
(In thousand)Operating
Leases		Finance
Leases
Year Ending December 31:
     2020 (excluding the nine months ended September 30, 2020)$8,126 $361 
     202127,315 1,330 
     202220,639 1,072 
     202315,818 869 
     202410,655 702 
     After 202441,421 113 
Total lease payments123,974 4,447 
Less: Imputed interest(29,402)(209)
Total$94,572 $4,238 
Maturities of Finance Lease Liabilities
Maturities of lease liabilities were as follows:
(In thousand)Operating
Leases		Finance
Leases
Year Ending December 31:
     2020 (excluding the nine months ended September 30, 2020)$8,126 $361 
     202127,315 1,330 
     202220,639 1,072 
     202315,818 869 
     202410,655 702 
     After 202441,421 113 
Total lease payments123,974 4,447 
Less: Imputed interest(29,402)(209)
Total$94,572 $4,238 
Future Minimum Payments Under Operating Leases with Noncancelable Terms
(In thousand)Operating
Leases		Finance
Leases
Year Ending December 31:
     2020 (excluding the nine months ended September 30, 2020)$8,126 $361 
     202127,315 1,330 
     202220,639 1,072 
     202315,818 869 
     202410,655 702 
     After 202441,421 113 
Total lease payments123,974 4,447 
Less: Imputed interest(29,402)(209)
Total$94,572 $4,238