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Leases
 9 Months Ended
Sep. 30, 2020
Leases [Abstract]  
Leases
(7)
Leases


The Company currently leases various facilities and equipment under cancelable and noncancelable operating leases. The accounting for the Company’s leases may require judgments, which include determining whether a contract contains a lease, allocating the consideration between lease and non-lease components, and determining the incremental borrowing rates. Leases with an initial noncancelable term of 12 months or less are not recorded on the balance sheet and related lease expense is recognized on a straight-line basis over the lease term.  The Company has also elected to combine lease and non-lease components on all classes of leased assets, except for leased towing vessels for which the Company estimates approximately 75% of the costs relate to service costs and other non-lease components. Variable lease costs relate primarily to real estate executory costs (i.e. taxes, insurance and maintenance).


Future minimum lease payments under operating leases that have initial noncancelable lease terms in excess of one year were as follows (in thousands):

   
September 30, 2020
    
December 31, 2019
  
2020
  
$
10,643
    
$
33,374
  
2021
    
38,059
      
25,911
  
2022
    
33,014
      
23,098
  
2023
    
27,500
      
19,162
  
2024
    
23,063
      
15,330
  
Thereafter
    
117,351
      
92,991
  
Total lease payments
    
249,630
      
209,866
  
Less: imputed interest
    
(49,201
)
    
(43,085
)
Operating lease liabilities
  
$
200,429
    
$
166,781
  



The following table sets forth lease costs (in thousands):

   
Three months ended September 30,
    
Nine months ended September 30,
  
 
2020
    
2019
    
2020
    
2019
  
Operating lease cost
  
$
11,553
    
$
9,490
    
$
32,467
    
$
29,461
  
Variable lease cost
    
485
      
386
      
1,081
      
1,417
  
Short-term lease cost
    
4,645
      
7,727
      
17,998
      
24,582
  
Sublease income
    
(418
)
    
(366
)
    
(792
)
    
(924
)
   
$
16,265
    
$
17,237
    
$
50,754
    
$
54,536
  


The following table summarizes other supplemental information about the Company’s operating leases :

  
September 30, 2020
    
December 31, 2019
  
Weighted average discount rate
    
4.1
%
    
4.0
%
Weighted average remaining lease term
  
10 years
    
11 years