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Leases
 6 Months Ended
Jun. 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):

   
June 30, 2020
    
December 31, 2019
  
2020
  
$
21,699
    
$
33,374
  
2021
    
37,597
      
25,911
  
2022
    
32,286
      
23,098
  
2023
    
26,779
      
19,162
  
2024
    
22,617
      
15,330
  
Thereafter
    
115,806
      
92,991
  
Total lease payments
    
256,784
      
209,866
  
Less: imputed interest
    
(51,394
)
    
(43,085
)
Operating lease liabilities
  
$
205,390
    
$
166,781
  


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

   
Three months ended June 30,
    
Six months ended June 30,
  
 
2020
    
2019
    
2020
    
2019
  
Operating lease cost
  
$
11,873
    
$
9,893
    
$
20,914
    
$
19,971
  
Variable lease cost
    
444
      
515
      
596
      
1,031
  
Short-term lease cost
    
5,076
      
8,963
      
13,353
      
16,855
  
Sublease income
    
(130
)
    
(318
)
    
(374
)
    
(558
)
   
$
17,263
    
$
19,053
    
$
34,489
    
$
37,299
  


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

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