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Leases (Tables)
 6 Months Ended
Jun. 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 EndedSix Months Ended
(In thousands)June 30
2020		June 30
2019		June 30
2020		June 30
2019
Finance leases:
Amortization expense$367  $312  $738  $586  
Interest on lease liabilities44  37  96  41  
Operating leases8,904  3,435  13,188  7,127  
Variable and short-term lease expense10,485  4,818  17,596  9,609  
Sublease income(48) —  (98) —  
Total lease expense from continuing operations$19,752  $8,602  $31,520  $17,363  

Supplemental cash flow information related to leases was as follows:
Six Months Ended
(In thousands)June 30
2020		June 30
2019
Cash paid for amounts included in the measurement of lease liabilities:
Cash flows from operating activities - Operating leases$12,384  $6,743  
Cash flows from financing activities - Finance leases663  637  
Right-of-use assets obtained in exchange for lease obligations:
Operating leases (a)
$67,534  $50,696  
Finance leases1,234  1,692  
(a)  Cash flows for the six months ended June 30, 2020 include ROU assets of approximately $56.0 million that were recorded upon the acquisition of ESOL. Cash flows for six months ended June 30, 2019 include ROU assets of approximately $34 million that were recorded upon adoption at January 1, 2019 and $14.4 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 is as follows:
June 30
2020		December 31
2019
Other information:
    Weighted average remaining lease term - Operating leases (in years)8.3311.57
    Weighted average remaining lease term - Finance leases (in years)3.774.01
     Weighted average discount rate - Operating leases6.1 %6.3 %
     Weighted average discount rate - Finance leases4.2 %4.2 %
Supplemental Balance Sheet Information Related to Leases
Supplemental balance sheet information related to leases was as follows: 
(In thousands)June 30
2020		December 31
2019
Operating Leases:
     Operating lease right-of-use assets$101,743  $52,065  
      Current portion of operating lease liabilities27,850  $12,544  
      Operating lease liabilities71,553  36,974  
Finance Leases:
   Property, plant and equipment, net$3,891  $3,519  
     Current maturities of long-term debt1,289  $1,237  
     Long-term debt2,735  2,218  
Maturities of Operating Lease Liabilities
Maturities of lease liabilities were as follows:
(In thousand)Operating
Leases		Finance
Leases
Year Ending December 31st:
     2020 (excluding the six months ended June 30, 2020)$16,446  $691  
     202127,125  1,208  
     202220,395  949  
     202315,786  749  
     202410,735  587  
     After 202441,421  43  
Total lease payments131,908  4,227  
Less: Imputed interest(32,505) (203) 
Total$99,403  $4,024  
Maturities of Finance Lease Liabilities
Maturities of lease liabilities were as follows:
(In thousand)Operating
Leases		Finance
Leases
Year Ending December 31st:
     2020 (excluding the six months ended June 30, 2020)$16,446  $691  
     202127,125  1,208  
     202220,395  949  
     202315,786  749  
     202410,735  587  
     After 202441,421  43  
Total lease payments131,908  4,227  
Less: Imputed interest(32,505) (203) 
Total$99,403  $4,024  
Future Minimum Payments Under Operating Leases with Noncancelable Terms
(In thousand)Operating
Leases		Finance
Leases
Year Ending December 31st:
     2020 (excluding the six months ended June 30, 2020)$16,446  $691  
     202127,125  1,208  
     202220,395  949  
     202315,786  749  
     202410,735  587  
     After 202441,421  43  
Total lease payments131,908  4,227  
Less: Imputed interest(32,505) (203) 
Total$99,403  $4,024