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Leases (Tables)
 12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Minimum future financial lease payments
The financial leasing liabilities are secured by the associated assets held under this modality. The minimum future financial leasing payments at the end of each reporting period are:
 
  
Within the
1st year
  
1 to 3
years
  
3 to 5
years
  
After 5
years
  
Total
 
Balance at December 31, 2017
               
Lease payments
 
$
39,619
  
$
79,346
  
$
96,999
  
$
117,860
  
$
333,824
 
Financial charges
  
(28,665
)
  
(51,346
)
  
(58,456
)
  
(12,925
)
  
(151,391
)
Present values, net
 
$
10,954
  
$
28,000
  
$
38,543
  
$
104,935
  
$
182,433
 
 
  
Within the
1st year
  
1 to 3
years
  
3 to 5
years
  
After 5
years
  
Total
 
                
Balance at December 31, 2016
               
Lease payments
 
$
41,483
  
$
82,966
  
$
85,355
  
$
164,888
  
$
374,692
 
Financial charges
  
(31,713
)
  
(58,032
)
  
(50,937
)
  
(33,223
)
  
(173,905
)
Present values, net
 
$
9,770
  
$
24,934
  
$
34,418
  
$
131,665
  
$
200,787
 
Summary of expiries of operating leases
At December 31, 2017, the operating leases report the following expiries:
 
Leased assets
Expire
Building
Apr. 2029
Cranes
Jul. 2020
Offshore vessels
Apr. 2018
Docks and equipment
Mar. 2018
Lift truck
Dec. 2019
Minimum future operating lease payments
The minimum future payments on operating leases are:
 
  
Within the
1st year
  
1 to 3
years
  
3 to 5
years
  
After 5
years
  
Total
 
Lease payments
               
At December 31, 2017
 
$
77,589
  
$
143,067
  
$
158,278
  
$
617,718
  
$
996,652
 
                     
At December 31, 2016
 
$
112,115
  
$
137,157
  
$
154,709
  
$
732,745
  
$
1,136,726