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Intangible assets and goodwill (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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