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Intangible assets and goodwill | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible assets and goodwill | Intangible assets and goodwill Intangible assets consist of the following:
2019 | Cost |  | Accumulated amortization |  | Net book value
Power sales contracts | $ | 56,206 |  |  | $ | 38,931 |  |  | $ | 17,275 |
Customer relationships | 26,797 |  |  | 10,104 |  |  | 16,693 |
Interconnection agreements | 14,827 |  |  | 1,179 |  |  | 13,648 |
| $ | 97,830 |  |  | $ | 50,214 |  |  | $ | 47,616 |
6. | Intangible assets and goodwill (continued)
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 |
Estimated amortization expense for intangible assets for the next year is $2,018, $2,190 in year two, $2,350 in year three, $1,910 in year four and $1,780 in year five. All goodwill pertains to the Regulated Services Group.
Balance, December 31, 2018 and 2017 |  | $ | 954,282 |
Business acquisitions (note 3(a)) |  | 76,313 |
Foreign exchange |  | 1,101 |
Balance, December 31, 2019 |  | $ | 1,031,696 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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