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Other long-term liabilities
 6 Months Ended
Jun. 30, 2020
Other Liabilities Disclosure [Abstract]  
Other long-term liabilities Other long-term liabilities
Other long-term liabilities consist of the following: 
 
June 30, 2020
 
December 31, 2019
Advances in aid of construction
$
62,664

 
$
60,828

Environmental remediation obligation
66,446

 
58,061

Asset retirement obligations
54,794

 
53,879

Customer deposits
31,708

 
31,946

Unamortized investment tax credits
18,051

 
18,234

Deferred credits
18,856

 
18,952

Contingent development support obligations
10,898

 
9,446

Preferred shares, Series C
12,975

 
13,793

Lease liabilities
14,248

 
9,695

Other
29,293

 
26,506

 
$
319,933

 
$
301,340

Less: current portion
(56,944
)
 
(57,939
)
 
$
262,989

 
$
243,401