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Business acquisitions and development projects (Tables)
 12 Months Ended
Dec. 31, 2017
Business Combinations [Abstract]  
Allocation of Assets Acquired and Liabilities Assumed
The following table summarizes the allocation of the assets acquired and liabilities assumed at the acquisition date:
Working capital
$
2,045

Property, plant and equipment
345,254

Notes receivable
1,781

Goodwill
210,463

Regulatory assets
54,548

Other assets
185

Long-term debt
(146,727
)
Regulatory liabilities
(3,758
)
Pension and OPEB
(18,747
)
Deferred income tax liability, net
(51,795
)
Other liabilities
(40,172
)
Total net assets acquired
$
353,077

The following table summarizes the allocation of the assets acquired and liabilities assumed at the acquisition date:
Working capital
$
198

Property, plant and equipment
145,045

Asset retirement obligation
(714
)
Non-controlling interest (tax equity)
(50,548
)
Total net assets acquired
$
93,981

The following table summarizes the final allocation of the purchase consideration to the assets and liabilities acquired as at January 1, 2017 based on their fair values, using the exchange rate on that date of U.S. $1.00 = CAD $1.3427.
Working capital
$
55,441

Property, plant and equipment
2,764,441

Goodwill
1,010,273

Regulatory assets
318,130

Other assets
58,553

Long-term debt
(1,218,563
)
Regulatory liabilities
(195,489
)
Pension and other post-employment benefits
(105,005
)
Deferred income tax liability, net
(562,397
)
Other liabilities
(102,759
)
Total net assets acquired
$
2,022,625

Cash and cash equivalent
$
2,338

Total net assets acquired, net of cash and cash equivalent
$
2,020,287

The following table summarizes the allocation of the assets acquired and liabilities assumed at the acquisition date:
Working capital
$
11,836

Property, plant and equipment
469,222

Asset retirement obligation
(4,812
)
Deferred tax liability
(4,273
)
Non-controlling interest (tax equity investors)
(237,156
)
Net assets
$
234,817

The following table summarizes the allocation of the assets acquired and liabilities assumed at the acquisition date:
Working Capital
$
(14,551
)
Property, plant and equipment
442,086

Construction loan
(352,666
)
Asset retirement obligation
(2,816
)
Deferred revenue
(1,556
)
Deferred tax liability
(1,979
)
Net assets acquired
$
68,518

Cash and cash equivalent
$
4,183

Net assets acquired, net of cash and cash equivalent
$
64,335
Business Acquisition, Pro Forma Information
The table below presents the consolidated pro forma revenue and net income for the year ended December 31, 2017 and 2016, assuming the acquisition of Empire had occurred on January 1, 2016. Pro forma net income includes the impact of fair value adjustments incorporated in the preliminary purchase price allocation above and adjustments necessary to reflect the financing costs as if the acquisition had been financed on January 1, 2016. However, non-recurring acquisition-related expenses are excluded from net income.
 
Year Ended December 31
 
2017
2016
Revenues
$
1,977,809

$
1,908,340

Net earnings attributable to common shareholders
$
229,976

$
213,983