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Other long-term liabilities
 6 Months Ended
Jun. 30, 2019
Other Liabilities Disclosure [Abstract]  
Other long-term liabilities
Other long-term liabilities
Other long-term liabilities consist of the following: 
 
June 30, 2019
 
December 31, 2018
Advances in aid of construction
$
60,106

 
$
63,703

Environmental remediation obligation
57,854

 
55,621

Asset retirement obligations
45,535

 
43,291

Customer deposits
30,329

 
29,974

Unamortized investment tax credits
17,688

 
17,491

Deferred credits
35,325

 
42,711

Preferred shares, Series C
13,860

 
13,418

Lease liabilities (note 1(c))
10,388

 
3,436

Other
33,829

 
36,274

 
304,914

 
305,919

Less: current portion
(43,787
)
 
(42,337
)
 
$
261,127

 
$
263,582