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Financial instruments (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments
(a)
Fair value of financial instruments
2017
Carrying
amount
 
Fair
Value
 
Level 1
 
Level 2
 
Level 3
Notes receivable
$
41,873

 
$
47,912

 
$
—

 
$
47,912

 
$
—

Derivative instruments (1):
 
 
 
 
 
 
 
 
 
Energy contracts designated as a cash flow hedge
79,490

 
79,490

 
—

 
—

 
79,490

Energy contracts not designated as a cash flow hedge
137

 
137

 
—

 
137

 
—

Commodity contracts for regulated operations
92

 
92

 
—

 
92

 
—

Transmission congestion rights
7,812

 
7,812

 
—

 
7,812

 
—

Total derivative instruments
87,531

 
87,531

 
—

 
8,041

 
79,490

Total financial assets
$
129,404

 
$
135,443

 
$
—

 
$
55,953

 
$
79,490

Long-term debt
$
3,863,296

 
$
4,093,071

 
$
817,895

 
$
3,275,176

 
$
—

Convertible debentures
1,218

 
1,277

 
1,277

 
—

 
—

Preferred shares, Series C
18,464

 
18,973

 

 
18,973

 
—

Derivative instruments:
 
 
 
 
 
 
 
 
 
Energy contracts designated as a cash flow hedge
97

 
97

 
—

 
—

 
97

Energy contracts not designated as a cash flow hedge

39

 
39

 
—

 
39

 
—

Cross-currency swap designated as a net investment hedge
72,023

 
72,023

 
—

 
72,023

 
—

Interest rate swap designated as a hedge
10,613

 
10,613

 
—

 
10,613

 
—

Currency forward contract not designated as a hedge
432

 
432

 
—

 
432

 
—

Commodity contracts for regulated operations
3,286

 
3,286

 
—

 
3,286

 
—

Total derivative instruments
86,490

 
86,490

 
—

 
86,393

 
97

Total financial liabilities
$
3,969,468

 
$
4,199,811

 
$
819,172

 
$
3,380,542

 
$
97

(1) Balance of $553 associated with certain weather derivatives have been excluded, as they are accounted for based on intrinsic value rather than fair value.
25.
Financial instruments (continued)
(a)Fair value of financial instruments (continued)
2016
Carrying
amount
 
Fair
Value
 
Level 1
 
Level 2
 
Level 3
Notes receivable
$
38,183

 
$
47,933

 
$
—

 
$
47,933

 
$
—

Derivative instruments (1):
 
 
 
 
 
 
 
 
 
Energy contracts designated as a cash flow hedge
84,554

 
84,554

 
—

 
—

 
84,554

Interest rate swap designated as a hedge
48,093

 
48,093

 
—

 
48,093

 
—

Currency forward contract not designated as a hedge
17,864

 
17,864

 
—

 
17,864

 
—

Commodity contracts for regulatory operations
359

 
359

 
—

 
359

 
—

Total derivative instruments
150,870

 
150,870

 
—

 
66,316

 
84,554

Total financial assets
$
189,053

 
$
198,803

 
$
—

 
$
114,249

 
$
84,554

Long-term debt
$
3,913,415

 
$
3,999,266

 
$
517,637

 
$
3,481,629

 
$
—

Convertible debentures
358,619

 
455,975

 
455,975

 
—

 
—

Preferred shares, Series C
18,460

 
18,613

 
—

 
18,613

 
—

Derivative instruments:
 
 
 
 
 
 
 
 
 
Cross-currency swap designated as a net investment hedge
95,404

 
95,404

 
—

 
95,404

 
—

Interest rate swaps designated as a hedge
13,385

 
13,385

 
—

 
13,385

 
—

Commodity contracts for regulated operations
36

 
36

 
—

 
36

 
—

Total derivative instruments
108,825

 
108,825

 
—

 
108,825

 
—

Total financial liabilities
$
4,399,319

 
$
4,582,679

 
$
973,612

 
$
3,609,067

 
$
—
Summary of Commodity Volumes Associated with Derivative Contracts
The following are commodity volumes, in dekatherms (“dths”) associated with the above derivative contracts:
 
2017
Financial contracts: Swaps
2,518,812

        Options
518,866

        Forward contracts
12,420,000

 
15,457,678
Impact of Change in Fair Value of Natural Gas Derivative Contracts
The following table presents the impact of the change in the fair value of the Company’s natural gas derivative contracts had on the consolidated balance sheets: 
 
 
2017
 
 
2016
Regulatory assets:
 
 
 
 
 
Swap contracts
U.S.
$
—

 
U.S.
$
—

Option contracts
U.S.
$
—

 
U.S.
$
27

Forward contracts
U.S.
$
6,319

 
U.S.
$
—

Regulatory liabilities:
 
 
 
 
 
Swap contracts
U.S.
$
287

 
U.S.
$
175

Option contracts
U.S.
$
138

 
U.S.
$
92

Forward contracts
U.S.
$
20,909

 
U.S.
$
—
Long-Term Energy Derivative Contracts
The Company reduces the price risk on the expected future sale of power generation at Sandy Ridge, Senate and Minonk Wind Facilities by entering into the following long-term energy derivative contracts. 
Notional quantity
(MW-hrs)
 
Expiry
 
Receive average
prices (per MW-hr)
 
Pay floating price
(per MW-hr)
688,147

 
 December 2023
 
U.S. $
 
40.40

 
PJM Western HUB
2,926,922

 
 December 2023
 
U.S. $
 
29.26

 
NI HUB
3,330,876

 
 December 2027
 
U.S. $
 
36.46

 
ERCOT North HUB
Derivative Financial Instruments Designated as Cash Flow Hedge, Effect on Consolidated Statement of Operations
The following table summarizes OCI attributable to derivative financial instruments designated as a cash flow hedge: 
 
2017
 
2016
 
 
 
 
Effective portion of cash flow hedge, gain
$
8,714

 
$
34,355

Amortization of cash flow hedge
(30
)
 
(47
)
Gain reclassified from AOCI
(6,775
)
 
(7,554
)
OCI attributable to shareholders of APUC
$
1,909

 
$
26,754
Effects on Statement of Operations of Derivative Financial Instruments Not Designated as Hedges
The effects on the consolidated statements of operations of derivative financial instruments not designated as hedges consist of the following:
 
2017
 
2016
Change in unrealized loss (gain) on derivative financial instruments:
 
 
 
Energy derivative contracts
$
(52
)
 
$
(426
)
Currency forward contract
432

 
(19,810
)
Commodity contracts
(3,916
)
 
—

Total change in unrealized gain on derivative financial instruments
$
(3,536
)
 
$
(20,236
)
Realized loss (gain) on derivative financial instruments:
 
 
 
Interest rate swaps
(193
)
 
—

Energy derivative contracts
730

 
951

Currency forward contract
16,413

 
(1,371
)
Total realized loss (gain) on derivative financial instruments
$
16,950

 
$
(420
)
Loss (gain) on derivative financial instruments not accounted for as hedges
13,414

 
(20,656
)
Ineffective portion of derivative financial instruments accounted for as hedges
805

 
1,518

 
$
14,219

 
$
(19,138
)
Amounts recognized in the consolidated statements of operations consist of:
 
 
 
Gain on derivative financial instruments
(2,626
)
 
(15,849
)
Loss (gain) on foreign exchange
16,845

 
(3,289
)
 
$
14,219

 
$
(19,138
)
Maximum Credit Risk Exposure for Financial Instruments
As of December 31, 2017, the Company’s maximum exposure to credit risk for these financial instruments was as follows: 
 
December 31, 2017
 
Canadian $
 
US $
Cash and cash equivalents and restricted cash
$
26,259

 
$
38,491

Accounts receivable
14,468

 
238,637

Allowance for doubtful accounts
—

 
(5,555
)
Notes receivable
37,710

 
3,318

 
$
78,437

 
$
274,891
Liabilities Maturity Profile
The Company’s liabilities mature as follows: 
 
Due less
than 1
year
 
Due 2 to 3
years
 
Due 4 to 5
years
 
Due after
5 years
 
Total
Long-term debt obligations
$
279,724

 
$
570,132

 
$
644,969

 
$
2,331,327

 
$
3,826,152

Convertible Debentures
—

—

—

 
—

 
1,218

 
1,218

Advances in aid of construction
1,502

 
—

 
—

 
77,134

 
78,636

Interest on long-term debt
172,659

 
307,463

 
250,824

 
1,275,184

 
2,006,130

Purchase obligations
501,867

 
—

 
—

 
—

 
501,867

Environmental obligation
7,765

 
18,858

 
5,373

 
39,877

 
71,873

Derivative financial instruments:
 
 
 
 
 
 
 
 
 
Cross-currency swap
4,386

 
8,077

 
64,726

 
(5,166
)
 
72,023

Interest rate swaps
10,613

 
—

 
—

 
—

 
10,613

Currency forward
432

 
—

 
—

 
—

 
432

Energy derivative and commodity contracts
2,290

 
1,035

 
—

 
97

 
3,422

Other obligations
44,969

 
—

 
—

 
110,267

 
155,236

Total obligations
$
1,026,207

 
$
905,565

 
$
965,892

 
$
3,829,938

 
$
6,727,602