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Intangible assets and goodwill (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible assets consist of the following:
2018
Cost
 
Accumulated
amortization
 
Net book
value
Power sales contracts
$
60,775

 
$
36,063

 
$
24,712

Customer relationships
26,795

 
9,476

 
17,319

Interconnection agreements
13,847

 
884

 
12,963

 
$
101,417

 
$
46,423

 
$
54,994


2017
Cost
 
Accumulated
amortization
 
Net book
value
Power sales contracts
$
56,540

 
$
36,878

 
$
19,662

Customer relationships
26,799

 
8,836

 
17,963

Interconnection agreements
14,181

—

703

 
13,478

 
$
97,520

 
$
46,417

 
$
51,103
Goodwill
Changes in goodwill are as follows:
 
 
Balance, January 1, 2017
$
228,377

Business acquisitions
752,418

Divestiture of operating entity (note 21(a))
(26,513
)
Balance, December 31, 2018 and 2017
$
954,282