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Accumulated other comprehensive income (loss)
 6 Months Ended
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated other comprehensive income (loss) Accumulated other comprehensive income (loss)
AOCI consists of the following balances, net of tax:
 
Foreign currency cumulative translation
 
Unrealized gain on cash flow hedges
 
Pension and post-employment actuarial changes
 
Total
Balance, January 1, 2019
$
(74,189
)
 
$
64,333

 
$
(9,529
)
 
$
(19,385
)
Adoption of ASU 2017-12 on hedging
—

 
186

 
—

 
186

Other comprehensive income (loss)
7,795

 
19,177

 
(7,999
)
 
18,973

Amounts reclassified from AOCI to the unaudited interim consolidated statement of operations
—

 
(8,597
)
 
1,490

 
(7,107
)
Net current period OCI
$
7,795

 
$
10,580

 
$
(6,509
)
 
$
11,866

OCI attributable to the non-controlling interests
(2,428
)
 
—

 
—

 
(2,428
)
Net current period OCI attributable to shareholders of APUC
$
5,367

 
$
10,580

 
$
(6,509
)
 
$
9,438

Balance, December 31, 2019
$
(68,822
)
 
$
75,099

 
$
(16,038
)
 
$
(9,761
)
Other comprehensive loss
(28,057
)
 
(12,890
)
 
—

 
(40,947
)
Amounts reclassified from AOCI to the unaudited interim consolidated statement of operations
—

 
(7,411
)
—

(21
)
 
(7,432
)
Net current period OCI
$
(28,057
)
 
$
(20,301
)
 
$
(21
)
 
$
(48,379
)
OCI attributable to the non-controlling interests
4,114

 
—

 
—

 
4,114

Net current period OCI attributable to shareholders of APUC
$
(23,943
)
 
$
(20,301
)
 
$
(21
)
 
$
(44,265
)
Balance, June 30, 2020
$
(92,765
)
 
$
54,798

 
$
(16,059
)
 
$
(54,026
)

Amounts reclassified from AOCI for unrealized gain (loss) on cash flow hedges affected revenue from non-regulated energy sales while those for pension and post-employment actuarial changes affected pension and post-employment non-service costs.