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Intangible assets and goodwill (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible assets consist of the following:
2017 |  |  |  |  |
| Cost |  | Accumulated amortization |  | Net book value
Power sales contracts | $ | 70,929 |  |  | $ | 46,263 |  |  | $ | 24,666 |
Customer relationships | 33,619 |  |  | 11,085 |  |  | 22,534 |
Interconnection agreements | 17,790 |  |  | 882 |  |  | 16,908 |
| $ | 122,338 |  |  | $ | 58,230 |  |  | $ | 64,108 |
6. | Intangible assets and goodwill (continued)
2016 |  |  |  |  |
| Cost |  | Accumulated amortization |  | Net book value
Power sales contracts | $ | 72,207 |  |  | $ | 44,641 |  |  | $ | 27,566 |
Customer relationships | 35,979 |  |  | 10,999 |  |  | 24,980 |
Interconnection agreements | 13,000 |  | — |  | 557 |  |  | 12,443 |
| $ | 121,186 |  |  | $ | 56,197 |  |  | $ | 64,989 |
Goodwill | Changes in goodwill are as follows:
Balance, January 1, 2016 | $ | 110,493 |
Business acquisitions | 210,463 |
Foreign exchange | (14,315 | )
Balance, December 31, 2016 | $ | 306,641 |
Business acquisitions (note 3(a)) | 1,010,273 |
Divestiture of operating entity (note 23(a)) | (35,107 | )
Foreign exchange | (85,573 | )
Balance, December 31, 2017 | $ | 1,196,234 |

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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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